diff --git a/internal/types/types.go b/internal/types/types.go
index faddca3cc4..022a875d29 100644
--- a/internal/types/types.go
+++ b/internal/types/types.go
@@ -58,7 +58,7 @@ type DataNode interface {
 
 	// GetMetrics gets the metrics about DataNode.
 	GetMetrics(ctx context.Context, req *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error)
-
+	// Compaction will add a compaction task according to the request plan
 	Compaction(ctx context.Context, req *datapb.CompactionPlan) (*commonpb.Status, error)
 }