diff --git a/docs/playbook-tags.md b/docs/playbook-tags.md
index 48e61f73c..e7b9682c0 100644
--- a/docs/playbook-tags.md
+++ b/docs/playbook-tags.md
@@ -27,7 +27,7 @@ Here are some playbook tags that you should be familiar with:
 
 - `stop` — stops all systemd services
 
-- `ensure-matrix-users-created` or its alias `ensure-users-created` — a special tag which ensures that all special users needed by the playbook (for bots, etc.) are created
+- `ensure-matrix-users-created` or its alias `ensure-users-created` — a special tag which ensures that all special users needed by the playbook (for bots, etc.) are created. See the variable `matrix_user_creator_users_auto` on [`group_vars/matrix_servers`](../group_vars/matrix_servers) for actual values of users which running this tag can create by default.
 
 **Notes**:
 - `setup-*` tags and `install-*` tags **do not start services** automatically, because you may wish to do things before starting services, such as importing a database dump, restoring data from another server, etc.
diff --git a/roles/custom/matrix-user-creator/tasks/main.yml b/roles/custom/matrix-user-creator/tasks/main.yml
index 6a1a0b20c..8f166bb1c 100644
--- a/roles/custom/matrix-user-creator/tasks/main.yml
+++ b/roles/custom/matrix-user-creator/tasks/main.yml
@@ -9,6 +9,8 @@
     # This role intentionally doesn't do work on a `setup-all` tag.
     # If it did, the initial installation (`--tags=setup-all`) would also potentially polute the database with data,
     # which would make importing a database dump problematic.
+    #
+    # See the variable "matrix_user_creator_users_auto" on group_vars/matrix_servers for actual values of users which running these tags can create with this role by default.
     - ensure-matrix-users-created
     - ensure-users-created
   block: