diff --git a/core/src/grpc/README.md b/core/src/grpc/README.md
deleted file mode 100644
index 6a3fe1157c..0000000000
--- a/core/src/grpc/README.md
+++ /dev/null
@@ -1,6 +0,0 @@
-We manually change two APIs in "milvus.pb.h":
-    add_vector_data()
-    add_row_id_array()
-    add_ids()
-    add_distances()
-If proto files need be generated again, remember to re-change above APIs.
\ No newline at end of file