diff --git a/nsecx.go b/nsecx.go
index d98992ad..744ddb49 100644
--- a/nsecx.go
+++ b/nsecx.go
@@ -15,7 +15,8 @@ type saltWireFmt struct {
 	Salt string `dns:"size-hex"`
 }
 
-// HashName hashes a string (label) according to RFC 5155. It returns the hashed string.
+// HashName hashes a string (label) according to RFC 5155. It returns the hashed string in
+// uppercase.
 func HashName(label string, ha uint8, iter uint16, salt string) string {
 	saltwire := new(saltWireFmt)
 	saltwire.Salt = salt