diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 525a08c..72459b0 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -4534,6 +4534,8 @@
 	be able to execute Normal mode commands.
 	This is the opposite of the 'keymap' option, where characters are
 	mapped in Insert mode.
+	Also consider setting 'langnoremap' to avoid 'langmap' applies to
+	characters resulting from a mapping.
 	This option cannot be set from a |modeline| or in the |sandbox|, for
 	security reasons.