diff --git a/core/src/grpc/README.md b/core/src/grpc/README.md
index 4f66d69f7fa4e32804e7605f7ef03c2a7900af8f..781d658842c650971abf561ae3b142e9a2641a7c 100644
--- a/core/src/grpc/README.md
+++ b/core/src/grpc/README.md
@@ -1,4 +1,4 @@
-We manually add two APIs in "milvus.pd.h":
+We manually change two APIs in "milvus.pd.h":
     add_vector_data()
     add_row_id_array()
-If proto files need be generated again, remember to re-add above APIs.
\ No newline at end of file
+If proto files need be generated again, remember to re-change above APIs.
\ No newline at end of file