diff --git a/cksum_test.go b/cksum_test.go
index 5402c38..b8aa2f7 100644
--- a/cksum_test.go
+++ b/cksum_test.go
@@ -11,6 +11,7 @@ var (
 	checkSize        = 9110
 )
 
+// testing that the cksum function matches that of cksum(1) utility (silly POSIX crc32)
 func TestCksum(t *testing.T) {
 	fh, err := os.Open(checkFile)
 	if err != nil {