diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
index 1854477..04a9fea 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
@@ -627,6 +627,7 @@
     // TODO: Do we still need docOnly bindings?
     this.shortcutsController.addAbstract(Shortcut.SEND_REPLY, () => {}); // docOnly
     this.shortcutsController.addAbstract(Shortcut.EMOJI_DROPDOWN, () => {}); // docOnly
+    this.shortcutsController.addAbstract(Shortcut.MENTIONS_DROPDOWN, () => {}); // docOnly
     this.shortcutsController.addAbstract(Shortcut.REFRESH_CHANGE, () =>
       fireReload(this, true)
     );
diff --git a/polygerrit-ui/app/services/shortcuts/shortcuts-config.ts b/polygerrit-ui/app/services/shortcuts/shortcuts-config.ts
index f0269f5..a7f4d19 100644
--- a/polygerrit-ui/app/services/shortcuts/shortcuts-config.ts
+++ b/polygerrit-ui/app/services/shortcuts/shortcuts-config.ts
@@ -101,6 +101,7 @@
   SEARCH = 'SEARCH',
   SEND_REPLY = 'SEND_REPLY',
   EMOJI_DROPDOWN = 'EMOJI_DROPDOWN',
+  MENTIONS_DROPDOWN = 'MENTIONS_DROPDOWN',
   TOGGLE_BLAME = 'TOGGLE_BLAME',
 
   TOGGLE_CHECKBOX = 'TOGGLE_CHECKBOX',
@@ -530,5 +531,11 @@
     'Emoji dropdown',
     {key: ':', docOnly: true}
   );
+  describe(
+    Shortcut.MENTIONS_DROPDOWN,
+    ShortcutSection.REPLY_DIALOG,
+    'Mentions dropdown',
+    {key: '@', docOnly: true}
+  );
   return config;
 }