diff --git a/extensions/force_user_invis.c b/extensions/force_user_invis.c
index fe6bbb4..a2c8247 100644
--- a/extensions/force_user_invis.c
+++ b/extensions/force_user_invis.c
@@ -3,6 +3,7 @@
  *
  * Based off no_oper_invis.c by jilles
  *
+ * Note that +i must be included in default_umodes
  */
 
 #include "stdinc.h"