diff --git a/docs/client/api.html b/docs/client/api.html
index fbcff47ae5..3fcc752161 100644
--- a/docs/client/api.html
+++ b/docs/client/api.html
@@ -44,6 +44,9 @@ followed by your application code.
       });
     }
 
+For mobile builds, the `startup` callback will only be called after the
+application has fully loaded.
+
 {{> api_box absoluteUrl}}
 
 {{> api_box settings}}