diff --git a/app/metrics.yaml b/app/metrics.yaml
index b5985e84c..3faa4cae8 100644
--- a/app/metrics.yaml
+++ b/app/metrics.yaml
@@ -107,7 +107,9 @@ events:
   browser_menu_action:
     type: event
     description: |
-      A browser menu item was tapped
+      A browser menu item was tapped.
+      The name of the item that the user tapped is stored in extras with the
+      key `item`.
     extra_keys:
       item:
         description: |