diff --git a/internal/proxy/meta_cache.go b/internal/proxy/meta_cache.go
index 1b2ddb4103..ac1f26ffd4 100644
--- a/internal/proxy/meta_cache.go
+++ b/internal/proxy/meta_cache.go
@@ -31,7 +31,9 @@ import (
 )
 
 type Cache interface {
+	// GetCollectionID get collection's id by name.
 	GetCollectionID(ctx context.Context, collectionName string) (typeutil.UniqueID, error)
+
 	GetCollectionInfo(ctx context.Context, collectionName string) (*collectionInfo, error)
 	GetPartitionID(ctx context.Context, collectionName string, partitionName string) (typeutil.UniqueID, error)
 	GetPartitions(ctx context.Context, collectionName string) (map[string]typeutil.UniqueID, error)