diff --git a/config.def.h b/config.def.h
index f287384..9384ef6 100644
--- a/config.def.h
+++ b/config.def.h
@@ -101,6 +101,8 @@ static const Key keys[] = {
 	TAGKEYS(          XKB_KEY_8, XKB_KEY_asterisk,                   7),
 	TAGKEYS(          XKB_KEY_9, XKB_KEY_parenleft,                  8),
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_Q,          quit,           {0} },
+
+	/* Ctrl-Alt-Backspace and Ctrl-Alt-Fx used to be handled by X server */
 	{ WLR_MODIFIER_CTRL|WLR_MODIFIER_ALT,XKB_KEY_Terminate_Server, quit, {0} },
 #define CHVT(n) { WLR_MODIFIER_CTRL|WLR_MODIFIER_ALT,XKB_KEY_XF86Switch_VT_##n, chvt, {.ui = (n)} }
 	CHVT(1), CHVT(2), CHVT(3), CHVT(4), CHVT(5), CHVT(6),