Spell out what the globs should operate on

Author: Johennes

proposals/4155-invite-filtering.md

@@ -33,8 +33,9 @@ event `m.invite_permission_config` is introduced.
 ```
 
 All properties in `content` are optional arrays. A missing or `null` property MUST be treated like an
-empty array. The array elements are [glob expressions] to be matched against user IDs and server names,
-respectively.
+empty array. The array elements are [glob expressions]. Any `*_users` glob is to be matched against
+full user IDs (localpart and domain). Any `*_servers` glob is to be matched against server names /
+domain parts of user IDs.
 
 When evaluating an invite, implementations MUST first apply the existing `m.ignored_user_list` as per
 the current spec. If the invite didn't match, implementations MUST then apply `m.invite_permission_config`.