diff --git a/common/utils/bitset/popcnt_19.go b/common/utils/bitset/popcnt_19.go
index 64c462b5f..1aa6ef4b4 100644
--- a/common/utils/bitset/popcnt_19.go
+++ b/common/utils/bitset/popcnt_19.go
@@ -3,6 +3,13 @@ package bitset32
 import "math/bits"
 
 func popcntSlice(s []uint32) uint64 {
+
+	// 	int r = 0;
+	// while(n)
+	// {
+	// n &= (n - 1);
+	// ++r;
+	// }
 	var cnt int
 	for _, x := range s {
 		cnt += bits.OnesCount32(x)