diff --git a/keepassxc-browser/_locales/en/messages.json b/keepassxc-browser/_locales/en/messages.json
index 15f1ffc..c0aaca0 100644
--- a/keepassxc-browser/_locales/en/messages.json
+++ b/keepassxc-browser/_locales/en/messages.json
@@ -992,7 +992,7 @@
         "description": "Label for adding site manually on Site preferences tab."
     },
     "optionsSitePreferencesManualAddHelp": {
-        "message": "The URL must start with either <code>https://</code>, <code>http://</code>, or <code>ftp://</code> and must be at least 10 characters long.",
+        "message": "The URL must start with either <code>https://</code>, <code>http://</code>, <code>file://</code>, or <code>ftp://</code> and must be at least 10 characters long.",
         "description": "Help text for adding site manually on Site preferences tab."
     },
     "optionsSitePreferencesConfirmation": {
diff --git a/keepassxc-browser/options/options.html b/keepassxc-browser/options/options.html
index fa49abf..f267c59 100644
--- a/keepassxc-browser/options/options.html
+++ b/keepassxc-browser/options/options.html
@@ -541,7 +541,7 @@
                     <div class="form-group">
                         <label for="manualUrl" data-i18n="optionsSitePreferencesManualAddText"></label>
                       <div class="input-group" id="manualUrlGroup">
-                        <input class="form-control form-control-sm col-lg-10" type="url" id="manualUrl" aria-label="Manual URL" pattern="ftp://.*|http://.*|https://.*" minlength="10" required>
+                        <input class="form-control form-control-sm col-lg-10" type="url" id="manualUrl" aria-label="Manual URL" pattern="file://.*|ftp://.*|http://.*|https://.*" minlength="10" required>
                         <div class="input-group-append">
                           <button class="btn btn-sm btn-primary" type="button" id="sitePreferencesManualAdd"><i class="fa fa-plus" aria-hidden="true"></i><span data-i18n="optionsButtonAdd"></span></button>
                         </div>