1 files changed, 1 insertions, 0 deletions
diff --git a/config.h b/config.h
index 7fff23a..7513012 100644
--- a/config.h
+++ b/config.h
@@ -75,6 +75,7 @@ typedef enum {
 #define SFT  1 << 0
 #define CTRL 1 << 2
 #define ALT  1 << 3
+// reference: <https://github.com/GNOME/gtk/blob/7ea7d5c3906ccd231b04654101bb742f157d82f6/gdk/gdkenums.h#L140>
 
 static struct {
 	unsigned mod;