diff --git a/client/entity/function.go b/client/entity/function.go
index 5e8c85dcde..1c172bbffd 100644
--- a/client/entity/function.go
+++ b/client/entity/function.go
@@ -29,6 +29,7 @@ const (
 	FunctionTypeUnknown       = schemapb.FunctionType_Unknown
 	FunctionTypeBM25          = schemapb.FunctionType_BM25
 	FunctionTypeTextEmbedding = schemapb.FunctionType_TextEmbedding
+	FunctionTypeRerank        = schemapb.FunctionType_Rerank
 )
 
 type Function struct {