diff --git a/docker/config.prod.yml b/docker/config.prod.yml
new file mode 100644
index 00000000000..07a9ea5366a
--- /dev/null
+++ b/docker/config.prod.yml
@@ -0,0 +1,3 @@
+# This is a sample config file for frontend.
+# Replace with production config.prod.yml.
+# It will be mounted to docker container.
diff --git a/docker/local.cfg b/docker/local.cfg
index 1edb0ce3c0d..fc008e0f344 100644
--- a/docker/local.cfg
+++ b/docker/local.cfg
@@ -1 +1,3 @@
-# This is a sample config file. Replace with production local.cfg to be mounted into docker.
+# This is a sample config file for backend.
+# Replace with production local.cfg.
+# It will be mounted to docker container.