diff --git a/wiki/Users-Gmail-Delegates.md b/wiki/Users-Gmail-Delegates.md
index addc5641..cd9a2b71 100644
--- a/wiki/Users-Gmail-Delegates.md
+++ b/wiki/Users-Gmail-Delegates.md
@@ -1,4 +1,5 @@
 # Users - Gmail - Delegates
+- [Notes](#notes)
 - [API documentation](#api-documentation)
 - [Definitions](#definitions)
 - [Aliases](#aliases)
@@ -8,6 +9,11 @@
 - [Display Gmail delegates](#display-gmail-delegates)
 - [Delete all delegates for a user](#delete-all-delegates-for-a-user)
 
+## Notes
+
+To use Gmail delegation, the delegator and delagatee must be in org units where
+mail delegation is enabled. In the admin console, go to Apps/Google Workspace/Gmail/User Settings.
+
 ## API documentation
 * [Gmail API - Delegates](https://developers.google.com/gmail/api/v1/reference/users.settings.delegates)
 * [Delegation Notes](https://support.google.com/a/answer/7223765)