diff --git a/src/rotate_column.c b/src/rotate_column.c
index 43f6b72..fb041d7 100644
--- a/src/rotate_column.c
+++ b/src/rotate_column.c
@@ -1,3 +1,4 @@
+// rotate tiles in brick by 1
 int rotate_col (void)
 {
 	int temp;