diff --git a/include/linux/input.h b/include/linux/input.h
index 18c98b5..e02c6a6 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -344,7 +344,8 @@
 #define KEY_BRIGHTNESSUP	225
 #define KEY_MEDIA		226
 
-#define KEY_SWITCHVIDEOMODE	227
+#define KEY_SWITCHVIDEOMODE	227	/* Cycle between available video
+					   outputs (Monitor/LCD/TV-out/etc) */
 #define KEY_KBDILLUMTOGGLE	228
 #define KEY_KBDILLUMDOWN	229
 #define KEY_KBDILLUMUP		230