diff --git a/deploy/vector_search/README.md b/deploy/vector_search/README.md
index 12cbfcf5f7ee15e73ac592c626cc7e2c383d8fd2..ea638219a4a6d6b59a0ca308a62fcb55de253c4a 100644
--- a/deploy/vector_search/README.md
+++ b/deploy/vector_search/README.md
@@ -60,7 +60,7 @@ brew install gcc
 ```
 ls /usr/local/bin/gcc*
 ```
-可以看到本地gcc对应的版本号为gcc-11，编译命令如下：
+可以看到本地gcc对应的版本号为gcc-11，编译命令如下(如果本地gcc版本为gcc-9, 则相应命令修改为`CXX=g++-9 make`：
 ```
 CXX=g++-11 make
 ```