diff --git a/parser.go b/parser.go
index ddf7e71..ab2a4bc 100644
--- a/parser.go
+++ b/parser.go
@@ -10,6 +10,7 @@ import (
 
 //------------------------------------------------------------------------------
 
+// Represents Redis nil reply.
 var Nil = errors.New("(nil)")
 
 //------------------------------------------------------------------------------