diff --git a/README.tpl b/README.tpl
index b7eaf03..38c007e 100644
--- a/README.tpl
+++ b/README.tpl
@@ -15,6 +15,14 @@ ${user_name}/namespace.image_name:image_tag
 k8s.gcr.io/{image}/{tag} <==> gcr.io/google-containers/{image}/{tag} <==> ${user_name}/google-containers.{image}/{tag}
 ```
 
+Add new namespace
+-------
+[Fork and edit sync branch file gcr_namespaces](https://github.com/anjia0532/gcr.io_mirror/edit/sync/gcr_namespaces)
+
+append new line about namespace(e.g. `gcr.io/google-containers`  u should append `google-containers`,`k8s.gcr.io` eq `gcr.io/google-containers`)
+
+save and commit a PR for this repo.
+
 Example
 -------