Merge pull request #104295 from yyuank/patch-11

Update groups-dynamic-membership.md

Author: PRMerger14

articles/active-directory/users-groups-roles/groups-dynamic-membership.md

@@ -336,13 +336,13 @@ device.objectId -ne null
 
 ## Extension properties and custom extension properties
 
-Extension attributes and custom extension properties are supported as string properties in dynamic membership rules. Extension attributes are synced from on-premises Window Server AD and take the format of "ExtensionAttributeX", where X equals 1 - 15. Here's an example of a rule that uses an extension attribute as a property:
+Extension attributes and custom extension properties are supported as string properties in dynamic membership rules. [Extension attributes](https://docs.microsoft.com/graph/api/resources/onpremisesextensionattributes?view=graph-rest-1.0) are synced from on-premises Window Server AD and take the format of "ExtensionAttributeX", where X equals 1 - 15. Here's an example of a rule that uses an extension attribute as a property:
 
 ```
 (user.extensionAttribute15 -eq "Marketing")
 ```
 
-Custom extension properties are synced from on-premises Windows Server AD or from a connected SaaS application and are of the format of `user.extension_[GUID]_[Attribute]`, where:
+[Custom extension properties](https://docs.microsoft.com/azure/active-directory/hybrid/how-to-connect-sync-feature-directory-extensions) are synced from on-premises Windows Server AD or from a connected SaaS application and are of the format of `user.extension_[GUID]_[Attribute]`, where:
 
 * [GUID] is the unique identifier in Azure AD for the application that created the property in Azure AD
 * [Attribute] is the name of the property as it was created