diff --git a/docs/en/modules/account/authority-delegation.md b/docs/en/modules/account/authority-delegation.md
index 9a973d65e0..fafe297677 100644
--- a/docs/en/modules/account/authority-delegation.md
+++ b/docs/en/modules/account/authority-delegation.md
@@ -77,6 +77,8 @@ You can click the `Delegate New User` button to delegate a new user:
 * You can specify a time range to ensure the delegation is only available within the time range.
 * You can make multiple delegates to the same user and set different delegate time ranges.
 
+> You have to enter the full username to query and delegate a user.
+
 > The delegation has three states: `Expired`, `Active`, and `Future`. These states are set automatically by checking the specified time interval.
 
 ### My delegated users
@@ -87,4 +89,4 @@ You can see a list of users who delegated you to login on their behalf of them,
 
 You can click the `Login` button to log in to the application as a delegated user and go back to your account by clicking the `Back to my account` icon:
 
-![account-pro-module-delegated-impersonate](../../images/account-pro-module-delegated-impersonate.jpg)
\ No newline at end of file
+![account-pro-module-delegated-impersonate](../../images/account-pro-module-delegated-impersonate.jpg)