diff --git a/composer.json b/composer.json
index 7718a47..83c8724 100644
--- a/composer.json
+++ b/composer.json
@@ -4,5 +4,8 @@
     },
     "require": {
         "erusev/parsedown": "^1.7"
+    },
+    "require-dev": {
+        "league/commonmark": "^2.3"
     }
 }
diff --git a/composer.lock b/composer.lock
index 2bcf570..5ff3829 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
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+    "content-hash": "18661f8c2155d955e7962271812bbed0",
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             "name": "erusev/parsedown",
@@ -57,7 +57,618 @@
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         }
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+    "packages-dev": [
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+            },
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+                "reference": "0992cc19268b259a39e86f296da5f0677841f42c",
+                "shasum": ""
+            },
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+                "php": "^7.1 || ^8.0"
+            },
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+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.3",
+                "scrutinizer/ocular": "1.6.0",
+                "squizlabs/php_codesniffer": "^3.5",
+                "vimeo/psalm": "^3.14"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
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+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Dflydev\\DotAccessData\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Dragonfly Development Inc.",
+                    "email": "info@dflydev.com",
+                    "homepage": "http://dflydev.com"
+                },
+                {
+                    "name": "Beau Simensen",
+                    "email": "beau@dflydev.com",
+                    "homepage": "http://beausimensen.com"
+                },
+                {
+                    "name": "Carlos Frutos",
+                    "email": "carlos@kiwing.it",
+                    "homepage": "https://github.com/cfrutos"
+                },
+                {
+                    "name": "Colin O'Dell",
+                    "email": "colinodell@gmail.com",
+                    "homepage": "https://www.colinodell.com"
+                }
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+            "description": "Given a deep data structure, access data by dot notation.",
+            "homepage": "https://github.com/dflydev/dflydev-dot-access-data",
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+                "access",
+                "data",
+                "dot",
+                "notation"
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+            },
+            "time": "2021-08-13T13:06:58+00:00"
+        },
+        {
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+            "version": "2.3.4",
+            "source": {
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+            },
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+                "league/config": "^1.1.1",
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+                "psr/event-dispatcher": "^1.0",
+                "symfony/deprecation-contracts": "^2.1 || ^3.0",
+                "symfony/polyfill-php80": "^1.16"
+            },
+            "require-dev": {
+                "cebe/markdown": "^1.0",
+                "commonmark/cmark": "0.30.0",
+                "commonmark/commonmark.js": "0.30.0",
+                "composer/package-versions-deprecated": "^1.8",
+                "embed/embed": "^4.4",
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+                "github/gfm": "0.29.0",
+                "michelf/php-markdown": "^1.4",
+                "nyholm/psr7": "^1.5",
+                "phpstan/phpstan": "^0.12.88 || ^1.0.0",
+                "phpunit/phpunit": "^9.5.5",
+                "scrutinizer/ocular": "^1.8.1",
+                "symfony/finder": "^5.3",
+                "symfony/yaml": "^2.3 | ^3.0 | ^4.0 | ^5.0 | ^6.0",
+                "unleashedtech/php-coding-standard": "^3.1",
+                "vimeo/psalm": "^4.7.3"
+            },
+            "suggest": {
+                "symfony/yaml": "v2.3+ required if using the Front Matter extension"
+            },
+            "type": "library",
+            "extra": {
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+                    "dev-main": "2.4-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "League\\CommonMark\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
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+                    "name": "Colin O'Dell",
+                    "email": "colinodell@gmail.com",
+                    "homepage": "https://www.colinodell.com",
+                    "role": "Lead Developer"
+                }
+            ],
+            "description": "Highly-extensible PHP Markdown parser which fully supports the CommonMark spec and GitHub-Flavored Markdown (GFM)",
+            "homepage": "https://commonmark.thephpleague.com",
+            "keywords": [
+                "commonmark",
+                "flavored",
+                "gfm",
+                "github",
+                "github-flavored",
+                "markdown",
+                "md",
+                "parser"
+            ],
+            "support": {
+                "docs": "https://commonmark.thephpleague.com/",
+                "forum": "https://github.com/thephpleague/commonmark/discussions",
+                "issues": "https://github.com/thephpleague/commonmark/issues",
+                "rss": "https://github.com/thephpleague/commonmark/releases.atom",
+                "source": "https://github.com/thephpleague/commonmark"
+            },
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+                    "url": "https://www.colinodell.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.paypal.me/colinpodell/10.00",
+                    "type": "custom"
+                },
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+            "version": "v1.1.1",
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+                "reference": "a9d39eeeb6cc49d10a6e6c36f22c4c1f4a767f3e"
+            },
+            "dist": {
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+                "url": "https://api.github.com/repos/thephpleague/config/zipball/a9d39eeeb6cc49d10a6e6c36f22c4c1f4a767f3e",
+                "reference": "a9d39eeeb6cc49d10a6e6c36f22c4c1f4a767f3e",
+                "shasum": ""
+            },
+            "require": {
+                "dflydev/dot-access-data": "^3.0.1",
+                "nette/schema": "^1.2",
+                "php": "^7.4 || ^8.0"
+            },
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+                "phpunit/phpunit": "^9.5.5",
+                "scrutinizer/ocular": "^1.8.1",
+                "unleashedtech/php-coding-standard": "^3.1",
+                "vimeo/psalm": "^4.7.3"
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+            "extra": {
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+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "League\\Config\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
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+                    "name": "Colin O'Dell",
+                    "email": "colinodell@gmail.com",
+                    "homepage": "https://www.colinodell.com",
+                    "role": "Lead Developer"
+                }
+            ],
+            "description": "Define configuration arrays with strict schemas and access values with dot notation",
+            "homepage": "https://config.thephpleague.com",
+            "keywords": [
+                "array",
+                "config",
+                "configuration",
+                "dot",
+                "dot-access",
+                "nested",
+                "schema"
+            ],
+            "support": {
+                "docs": "https://config.thephpleague.com/",
+                "issues": "https://github.com/thephpleague/config/issues",
+                "rss": "https://github.com/thephpleague/config/releases.atom",
+                "source": "https://github.com/thephpleague/config"
+            },
+            "funding": [
+                {
+                    "url": "https://www.colinodell.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.paypal.me/colinpodell/10.00",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/colinodell",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-08-14T12:15:32+00:00"
+        },
+        {
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+            "version": "v1.2.2",
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+                "type": "git",
+                "url": "https://github.com/nette/schema.git",
+                "reference": "9a39cef03a5b34c7de64f551538cbba05c2be5df"
+            },
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+                "url": "https://api.github.com/repos/nette/schema/zipball/9a39cef03a5b34c7de64f551538cbba05c2be5df",
+                "reference": "9a39cef03a5b34c7de64f551538cbba05c2be5df",
+                "shasum": ""
+            },
+            "require": {
+                "nette/utils": "^2.5.7 || ^3.1.5 ||  ^4.0",
+                "php": ">=7.1 <8.2"
+            },
+            "require-dev": {
+                "nette/tester": "^2.3 || ^2.4",
+                "phpstan/phpstan-nette": "^0.12",
+                "tracy/tracy": "^2.7"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.2-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause",
+                "GPL-2.0-only",
+                "GPL-3.0-only"
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+                {
+                    "name": "David Grudl",
+                    "homepage": "https://davidgrudl.com"
+                },
+                {
+                    "name": "Nette Community",
+                    "homepage": "https://nette.org/contributors"
+                }
+            ],
+            "description": "📐 Nette Schema: validating data structures against a given Schema.",
+            "homepage": "https://nette.org",
+            "keywords": [
+                "config",
+                "nette"
+            ],
+            "support": {
+                "issues": "https://github.com/nette/schema/issues",
+                "source": "https://github.com/nette/schema/tree/v1.2.2"
+            },
+            "time": "2021-10-15T11:40:02+00:00"
+        },
+        {
+            "name": "nette/utils",
+            "version": "v3.2.7",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nette/utils.git",
+                "reference": "0af4e3de4df9f1543534beab255ccf459e7a2c99"
+            },
+            "dist": {
+                "type": "zip",
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+                "reference": "0af4e3de4df9f1543534beab255ccf459e7a2c99",
+                "shasum": ""
+            },
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+                "php": ">=7.2 <8.2"
+            },
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+                "nette/tester": "~2.0",
+                "phpstan/phpstan": "^1.0",
+                "tracy/tracy": "^2.3"
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+            "suggest": {
+                "ext-gd": "to use Image",
+                "ext-iconv": "to use Strings::webalize(), toAscii(), chr() and reverse()",
+                "ext-intl": "to use Strings::webalize(), toAscii(), normalize() and compare()",
+                "ext-json": "to use Nette\\Utils\\Json",
+                "ext-mbstring": "to use Strings::lower() etc...",
+                "ext-tokenizer": "to use Nette\\Utils\\Reflection::getUseStatements()",
+                "ext-xml": "to use Strings::length() etc. when mbstring is not available"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.2-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause",
+                "GPL-2.0-only",
+                "GPL-3.0-only"
+            ],
+            "authors": [
+                {
+                    "name": "David Grudl",
+                    "homepage": "https://davidgrudl.com"
+                },
+                {
+                    "name": "Nette Community",
+                    "homepage": "https://nette.org/contributors"
+                }
+            ],
+            "description": "🛠  Nette Utils: lightweight utilities for string & array manipulation, image handling, safe JSON encoding/decoding, validation, slug or strong password generating etc.",
+            "homepage": "https://nette.org",
+            "keywords": [
+                "array",
+                "core",
+                "datetime",
+                "images",
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+                "nette",
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+                "string",
+                "unicode",
+                "utf-8",
+                "utility",
+                "validation"
+            ],
+            "support": {
+                "issues": "https://github.com/nette/utils/issues",
+                "source": "https://github.com/nette/utils/tree/v3.2.7"
+            },
+            "time": "2022-01-24T11:29:14+00:00"
+        },
+        {
+            "name": "psr/event-dispatcher",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/event-dispatcher.git",
+                "reference": "dbefd12671e8a14ec7f180cab83036ed26714bb0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/event-dispatcher/zipball/dbefd12671e8a14ec7f180cab83036ed26714bb0",
+                "reference": "dbefd12671e8a14ec7f180cab83036ed26714bb0",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
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+            "autoload": {
+                "psr-4": {
+                    "Psr\\EventDispatcher\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Standard interfaces for event handling.",
+            "keywords": [
+                "events",
+                "psr",
+                "psr-14"
+            ],
+            "support": {
+                "issues": "https://github.com/php-fig/event-dispatcher/issues",
+                "source": "https://github.com/php-fig/event-dispatcher/tree/1.0.0"
+            },
+            "time": "2019-01-08T18:20:26+00:00"
+        },
+        {
+            "name": "symfony/deprecation-contracts",
+            "version": "v3.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/deprecation-contracts.git",
+                "reference": "07f1b9cc2ffee6aaafcf4b710fbc38ff736bd918"
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+                "reference": "07f1b9cc2ffee6aaafcf4b710fbc38ff736bd918",
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+                    "function.php"
+                ]
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
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+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "A generic function and convention to trigger deprecation notices",
+            "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/deprecation-contracts/tree/v3.1.1"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
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+                    "type": "github"
+                },
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+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-02-25T11:15:52+00:00"
+        },
+        {
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+            "version": "v1.26.0",
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+                "reference": "cfa0ae98841b9e461207c13ab093d76b0fa7bace"
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+                "type": "zip",
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+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php80\\": ""
+                },
+                "classmap": [
+                    "Resources/stubs"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ion Bazan",
+                    "email": "ion.bazan@gmail.com"
+                },
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-php80/tree/v1.26.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-05-10T07:21:04+00:00"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": [],
diff --git a/src/includes/markup.commonmark.php b/src/includes/markup.commonmark.php
new file mode 100644
index 0000000..ae1c7fc
--- /dev/null
+++ b/src/includes/markup.commonmark.php
@@ -0,0 +1,62 @@
+<?php
+
+/*
+    This file is a part of myTinyTodo.
+    (C) Copyright 2022 Max Pozdeev <maxpozdeev@gmail.com>
+    Licensed under the GNU GPL version 2 or any later. See file COPYRIGHT for details.
+*/
+
+require_once(MTTINC. 'vendor/autoload.php');
+
+use League\CommonMark\MarkdownConverter;
+use League\CommonMark\Environment\Environment;
+use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;
+use League\CommonMark\Extension\GithubFlavoredMarkdownExtension;
+use League\CommonMark\Extension\Mention\MentionExtension;
+use League\CommonMark\Extension\Mention\Mention;
+
+class MTTCommonmarkWrapper implements MTTMarkdownInterface
+{
+    protected $toExternal;
+
+    /** @var MarkdownConverter */
+    protected $converter;
+
+    function __construct()
+    {
+        $this->toExternal = false;
+
+        $environment = new Environment([
+            'html_input' => 'escape',
+            'allow_unsafe_links' => false,
+            'mentions' => [
+                'task_id' => [
+                    'prefix'    => '#',
+                    'pattern'   => '\d+',
+                    'generator' => function ($mention) {
+                        if (!($mention instanceof Mention)) {
+                            return null;
+                        }
+                        $mention->setUrl(\sprintf(get_mttinfo('url'). "?task=%d", $mention->getIdentifier()));
+                        $mention->data->append('attributes/class', 'test-class');
+                        if (!$this->toExternal) {
+                            $mention->data->append('attributes/class', 'mtt-link-to-task');
+                            $mention->data->append('attributes/data-target-id', $attrs['target-id'] = $mention->getIdentifier());
+                        }
+                        return $mention;
+                    },
+                ]
+            ],
+        ]);
+        $environment->addExtension(new CommonMarkCoreExtension());
+        $environment->addExtension(new GithubFlavoredMarkdownExtension());
+        $environment->addExtension(new MentionExtension());
+        $this->converter = new MarkdownConverter($environment);
+    }
+
+    public function convert(string $s, bool $toExternal = false)
+    {
+        $this->toExternal = $toExternal;
+        return (string) $this->converter->convert($s);
+    }
+}
diff --git a/src/includes/markup.php b/src/includes/markup.php
index 016c69f..0832562 100644
--- a/src/includes/markup.php
+++ b/src/includes/markup.php
@@ -7,6 +7,7 @@
 */
 
 require_once(MTTINC. 'markup.parsedown.php');
+//require_once(MTTINC. 'markup.commonmark.php');
 
 interface MTTMarkdownInterface
 {
@@ -26,6 +27,7 @@ final class MTTMarkdown
     {
         if (!isset(self::$instance)) {
             self::$instance = new MTTParsedownWrapper();
+            //self::$instance = new MTTCommonmarkWrapper();
         }
         return self::$instance;
     }