diff --git a/col.c b/col.c
index f7f24e4..72d4119 100644
--- a/col.c
+++ b/col.c
@@ -1,4 +1,4 @@
-
+/* See LICENSE file for copyright and license details. */
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>