diff --git a/doc/advanced/config-cheat-sheet.en-us.md b/doc/advanced/config-cheat-sheet.en-us.md
index 2a245ffd..53c4639e 100644
--- a/doc/advanced/config-cheat-sheet.en-us.md
+++ b/doc/advanced/config-cheat-sheet.en-us.md
@@ -272,6 +272,10 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 - `MAX_GIT_DIFF_FILES`: **100**: Max number of files shown in diff view.
 - `GC_ARGS`: **\<empty\>**: Arguments for command `git gc`, e.g. `--aggressive --auto`.
 
+## U2F (`U2F`)
+- `APP_ID`: **`ROOT_URL`**: Declares the facet of the application. Requires HTTPS.
+- `TRUSTED_FACETS`: List of additional facets which are trusted. This is not support by all browsers.
+
 ## Markup (`markup`)
 
 Gitea can support Markup using external tools. The example below will add a markup named `asciidoc`.
diff --git a/doc/features/comparison.en-us.md b/doc/features/comparison.en-us.md
index db0d3b55..75553a89 100644
--- a/doc/features/comparison.en-us.md
+++ b/doc/features/comparison.en-us.md
@@ -535,6 +535,15 @@ _Symbols used in table:_
       <td>✓</td>
       <td>✓</td>
     </tr>
+    <tr>
+      <td>FIDO U2F (2FA)</td>
+      <td>✓</td>
+      <td>✘</td>
+      <td>✓</td>
+      <td>✓</td>
+      <td>✓</td>
+      <td>✓</td>
+    </tr>
     <tr>
       <td>Webhook support</td>
       <td>✓</td>