diff --git a/roaring/roaring_test.go b/roaring/roaring_test.go
index cf4fc44e7..c721f3804 100644
--- a/roaring/roaring_test.go
+++ b/roaring/roaring_test.go
@@ -191,6 +191,8 @@ func TestBitmap_Max(t *testing.T) {
 		}
 	}
 }
+
+// Ensure CountRange is correct even if rangekey is prior to inital container.
 func TestBitmap_BitmapCountRangeEdgeCase(t *testing.T) {
 	s := uint64(2009 * 1048576)
 	e := uint64(2010 * 1048576)