diff --git a/paddle/fluid/inference/api/paddle_inference_api.h b/paddle/fluid/inference/api/paddle_inference_api.h
index ab4fa820e6633db76090e4052d7f075e4e07db62..07ee6e72d1053d2271b8f8d69ce38003f5e038a0 100644
--- a/paddle/fluid/inference/api/paddle_inference_api.h
+++ b/paddle/fluid/inference/api/paddle_inference_api.h
@@ -261,6 +261,7 @@ struct AnalysisConfig : public NativeConfig {
 
   void SetIncludeMode() {
     ir_mode = IrPassMode::kInclude;
+    // this pass has to be run at the beginning of all fuse passes
     ir_passes = {"infer_clean_graph_pass"};
   }