diff --git a/bubulles.c b/bubulles.c
index 129c49d..8b09c87 100644
--- a/bubulles.c
+++ b/bubulles.c
@@ -206,6 +206,7 @@ return 0;
 /* flags :
  *	0x0001		print diameter
  *	0x0002		print graylevel
+ *	0x0004		print RGB values
  */
 int fprint_bubulles(FILE *fp, char *title, BBList *bbl, int opts)
 {