diff --git a/README.md b/README.md
index 766b953..dbde83a 100644
--- a/README.md
+++ b/README.md
@@ -5,4 +5,6 @@ $ docker compose up
 $ make
 ```
 
-To generate new cert and key, just run the `./create-cert.sh`
\ No newline at end of file
+Before running `make` (`go run client/main.go`), please make sure that this: https://github.com/diorahman/hello-envoy-grpc-tls/blob/master/client/main.go#L35 is suitable for your env (this `192.168.64.6` is my `DOCKER_HOST` IP, on Linux, I believe you should just put localhost).
+
+To generate new cert and key, just run the `./create-cert.sh`