diff --git a/src/option.h b/src/option.h
index 4ccde58..dc56629 100644
--- a/src/option.h
+++ b/src/option.h
@@ -212,7 +212,8 @@
 #define SHM_SEARCH	's'		/* no search hit bottom messages */
 #define SHM_ATTENTION	'A'		/* no ATTENTION messages */
 #define SHM_INTRO	'I'		/* intro messages */
-#define SHM_ALL		"rmfixlnwaWtToOsAI" /* all possible flags for 'shm' */
+#define SHM_COMPLETIONMENU  'c'		/* completion menu messages */
+#define SHM_ALL		"rmfixlnwaWtToOsAIc" /* all possible flags for 'shm' */
 
 /* characters for p_go: */
 #define GO_ASEL		'a'		/* autoselect */