diff --git a/src/components/FileExplorer.tsx b/src/components/FileExplorer.tsx
index a63172f..923dff2 100644
--- a/src/components/FileExplorer.tsx
+++ b/src/components/FileExplorer.tsx
@@ -46,7 +46,7 @@ const RawFileExplorer: React.FC<Props & ConnectorState> = function RawFileExplor
     searched,
   } = props
   const {
-    value: { accessToken, compressSingletonFolder, searchMode },
+    value: { accessToken, compressSingletonFolder, searchMode, commentToggle },
   } = useConfigs()
 
   const onSearch = React.useCallback(
@@ -105,18 +105,26 @@ const RawFileExplorer: React.FC<Props & ConnectorState> = function RawFileExplor
           <Icon type="search" />
         </button>
       ) : undefined
+    const renderFileCommentAmounts = (node: TreeNode): React.ReactNode =>
+      node.comments !== undefined &&
+      node.comments > 0 && (
+        <span className={'node-item-comment'}>
+          <Icon type={'comment'} /> {node.comments}
+        </span>
+      )
 
     const renders: ((node: TreeNode) => React.ReactNode)[] = []
+    if (commentToggle) renders.push(renderFileCommentAmounts)
     if (searchMode === 'fuzzy') renders.push(renderFindInFolderButton)
     if (searched) renders.push(renderGoToButton)
 
     return renders.length
       ? node => renders.map((render, i) => <React.Fragment key={i}>{render(node)}</React.Fragment>)
       : undefined
-  }, [goTo, onSearch, searched, searchMode])
+  }, [goTo, onSearch, searched, searchMode, commentToggle])
 
   const renderLabelText = React.useCallback(
-    node => searchModes[searchMode].renderNodeLabelText(node, searchKey),
+    (node: TreeNode) => searchModes[searchMode].renderNodeLabelText(node, searchKey),
     [searchKey, searchMode],
   )
 
diff --git a/src/components/Icon.tsx b/src/components/Icon.tsx
index 1316963..d3f8eb4 100644
--- a/src/components/Icon.tsx
+++ b/src/components/Icon.tsx
@@ -2,6 +2,7 @@ import {
   ChevronDownIcon as ChevronDown,
   ChevronRightIcon as ChevronRight,
   ClockIcon as Clock,
+  CommentIcon as Comment,
   FileCodeIcon as FileCode,
   FileIcon as File,
   FileMediaIcon as FileMedia,
@@ -25,6 +26,7 @@ import { cx } from 'utils/cx'
 const iconToComponentMap = {
   Search,
   Clock,
+  Comment,
   Hourglass,
   Submodule,
   Grabber,
@@ -53,6 +55,7 @@ const typeToIconComponentMap: {
   submodule: 'Submodule',
   grabber: 'Grabber',
   octoface: 'Octoface',
+  comment: 'Comment',
   x: 'X',
   pin: 'Pin',
   tab: 'Tab',
diff --git a/src/components/settings/SidebarSettings.tsx b/src/components/settings/SidebarSettings.tsx
index 1370a66..69b7955 100644
--- a/src/components/settings/SidebarSettings.tsx
+++ b/src/components/settings/SidebarSettings.tsx
@@ -107,6 +107,14 @@ export function SidebarSettings(props: React.PropsWithChildren<Props>) {
           },
         }}
       />
+      <SimpleToggleField
+        field={{
+          key: 'commentToggle',
+          label: 'Toggle comments',
+          tooltip:
+            'Show number of comments next to file names.',
+        }}
+      />
     </SettingsSection>
   )
 }
diff --git a/src/global.d.ts b/src/global.d.ts
index 2bd80d8..80a88bb 100644
--- a/src/global.d.ts
+++ b/src/global.d.ts
@@ -16,6 +16,7 @@ type TreeNode = {
   url?: string
   sha?: string
   accessDenied?: boolean
+  comments?: number
 }
 
 type IO<T, ChangeT = T> = {
diff --git a/src/platforms/GitHub/API.ts b/src/platforms/GitHub/API.ts
index 083912e..0491ef9 100644
--- a/src/platforms/GitHub/API.ts
+++ b/src/platforms/GitHub/API.ts
@@ -106,6 +106,16 @@ export async function getPullTreeData(
   return await request(url, { accessToken })
 }
 
+export async function getPullComments(
+  userName: string,
+  repoName: string,
+  pullId: string,
+  accessToken?: string,
+): Promise<GitHubAPI.PullComments> {
+  const url = `https://${API_ENDPOINT}/repos/${userName}/${repoName}/pulls/${pullId}/comments`
+  return await request(url, { accessToken })
+}
+
 export async function getPullPageDocument(
   userName: string,
   repoName: string,
diff --git a/src/platforms/GitHub/Request.d.ts b/src/platforms/GitHub/Request.d.ts
index a010a1c..5b9d8c1 100644
--- a/src/platforms/GitHub/Request.d.ts
+++ b/src/platforms/GitHub/Request.d.ts
@@ -35,7 +35,19 @@ declare namespace GitHubAPI {
     changed_files: number
   }
 
+  type PullComment = {
+    path: string
+    pull_request_review_id: number
+    id: number
+    node_id: string
+    diff_hunk: string
+    body: string
+    html_url: string
+    author_association: string
+  }
+
   type PullTreeData = PullTreeItem[]
+  type PullComments = PullComment[]
 
   type MetaData = {
     name: string
diff --git a/src/platforms/GitHub/index.ts b/src/platforms/GitHub/index.ts
index 9668172..159d1b1 100644
--- a/src/platforms/GitHub/index.ts
+++ b/src/platforms/GitHub/index.ts
@@ -160,9 +160,10 @@ export const GitHub: Platform = {
         GITHUB_API_RESPONSE_LENGTH_LIMIT / GITHUB_API_PAGED_RESPONSE_LENGTH_LIMIT,
       )
       let page = 1
-      const [pullData, treeData] = await Promise.all([
+      const [pullData, treeData, commentData] = await Promise.all([
         API.getPullData(userName, repoName, pullId, accessToken),
         API.getPullTreeData(userName, repoName, pullId, page, accessToken),
+        API.getPullComments(userName, repoName, pullId, accessToken),
       ])
 
       const count = pullData.changed_files
@@ -190,6 +191,7 @@ export const GitHub: Platform = {
           window.location.search
         }#${creator(item.filename) || ''}`,
         sha: item.sha,
+        comments: commentData?.filter(comment => item.filename === comment.path).length,
       }))
 
       const root = processTree(nodes)
diff --git a/src/styles/index.scss b/src/styles/index.scss
index 91138d6..ecd8320 100644
--- a/src/styles/index.scss
+++ b/src/styles/index.scss
@@ -524,6 +524,12 @@ $minimal-z-index: max($github-header-z-index, $github-pull-request-float-header-
 
         .node-item {
           background: var(--gitako-bg-primary);
+          &:hover {
+            text-decoration: initial; // revert underline from .gitako-side-bar a:hover
+            .node-item-label {
+              text-decoration: underline; // apply underline like .gitako-side-bar a:hover
+            }
+          }
           &.focused,
           &:hover {
             background: var(--gitako-bg-tertiary);
@@ -598,6 +604,15 @@ $minimal-z-index: max($github-header-z-index, $github-pull-request-float-header-
             }
           }
 
+          .node-item-comment {
+            padding: 0 4px;
+            color: var(--gitako-text-tertiary);
+
+            .octicon-wrapper {
+              margin: 0; // make it closer to the comment amount label
+            }
+          }
+
           .go-to-button,
           .find-in-folder-button {
             @include icon-button();
diff --git a/src/utils/config/helper.ts b/src/utils/config/helper.ts
index 9680976..2bacbcf 100644
--- a/src/utils/config/helper.ts
+++ b/src/utils/config/helper.ts
@@ -17,6 +17,7 @@ export type Config = {
   recursiveToggleFolder: 'shift' | 'alt'
   searchMode: SearchMode
   sidebarToggleMode: 'persistent' | 'float'
+  commentToggle: boolean
 }
 
 enum configKeys {
@@ -33,6 +34,7 @@ enum configKeys {
   recursiveToggleFolder = 'recursiveToggleFolder',
   searchMode = 'searchMode',
   sidebarToggleMode = 'sidebarToggleMode',
+  commentToggle = 'commentToggle',
 }
 
 export const defaultConfigs: Config = {
@@ -49,6 +51,7 @@ export const defaultConfigs: Config = {
   recursiveToggleFolder: 'shift',
   searchMode: 'fuzzy',
   sidebarToggleMode: 'float',
+  commentToggle: true,
 }
 
 const configKeyArray = Object.values(configKeys)