diff --git a/docs/help/in/levels.in b/docs/help/in/levels.in
index 429dd7c0..99f3070a 100644
--- a/docs/help/in/levels.in
+++ b/docs/help/in/levels.in
@@ -32,6 +32,7 @@
 
         HILIGHT         The text is highlighted.
         NEVER           Never ignores or logs the message.
+        HIDDEN          Hides the message when window HIDELEVEL includes HIDDEN.
         NO_ACT          Doesn't trigger any activity in the statusbar.
         NOHILIGHT       The text is not highlighted.