diff --git a/dbs/dbs.go b/dbs/dbs.go
index a548ea6..6c9ba7d 100644
--- a/dbs/dbs.go
+++ b/dbs/dbs.go
@@ -35,6 +35,7 @@ var str = [...]string{
 	"equal",
 	"not",
 	"elemMatch",
+	"or",
 }
 
 func (m Operator) String() string {