diff --git a/day-11/util.go b/day-11/util.go
index cea9953..4c246fa 100644
--- a/day-11/util.go
+++ b/day-11/util.go
@@ -24,6 +24,8 @@ func readlines() []string {
 	return lines
 }
 
+// parseInput stores coordinates of galaxies
+// stores empty row and column indexes
 func parseInput(lines []string) {
 	x := 0
 	runes = make([][]rune, len(lines))