diff --git a/README.md b/README.md
index 5942762..8498b97 100644
--- a/README.md
+++ b/README.md
@@ -30,4 +30,8 @@ gcloud auth application-default login
 gcloud docker -- push gcr.io/pod-sync/ytdl
 ```
 
-or just use `build.sh`
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+or just use `build.sh`
+
+## Access to Container Registry from docker
+
+See https://cloud.google.com/container-registry/docs/advanced-authentication for details
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