diff --git a/roaring/roaring.go b/roaring/roaring.go
index 065f4e6df..6fa53f472 100644
--- a/roaring/roaring.go
+++ b/roaring/roaring.go
@@ -234,6 +234,8 @@ func (b *Bitmap) CountRange(start, end uint64) (n uint64) {
 
 	// Count containers in between.
 	for x := i + 1; x < j; x++ {
+		// Ensure that current container is inside the requested range since
+		// keys to not have to be consecutive
 		if ekey < b.keys[x] {
 			break
 		}