diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index ca8f6c406d..7fa561aa03 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -282,6 +282,11 @@ listeners:
 #
 #allow_per_room_profiles: false
 
+# Whether to show the users on this homeserver in the user directory. Defaults to
+# 'true'.
+#
+#show_users_in_user_directory: false
+
 
 ## TLS ##