diff --git a/calmwm.h b/calmwm.h
index 4c915a8..d5c77b6 100644
--- a/calmwm.h
+++ b/calmwm.h
@@ -480,6 +480,7 @@ void			 search_match_exec(struct menu_q *, struct menu_q *,
 void			 group_init(void);
 void			 group_hidetoggle(int);
 void			 group_cycle(int);
+void			 group_only(int);
 void			 group_sticky(struct client_ctx *);
 void			 group_client_delete(struct client_ctx *);
 void			 group_menu(XButtonEvent *);