diff --git a/docs/deploying.md b/docs/deploying.md
index 740adac2..4e8fe13b 100644
--- a/docs/deploying.md
+++ b/docs/deploying.md
@@ -562,6 +562,6 @@ More specific and advanced information is available in the following sections:
  - [Configuration reference](configuration.md)
  - [Working with notifications](notifications.md)
  - [Advanced "recipes"](recipes/index.md)
- - [Registry API](spec/api.md)
+ - [Registry API](/registry/spec/api.md)
  - [Storage driver model](storage-drivers/index.md)
  - [Token authentication](spec/auth/token.md)
diff --git a/docs/storage-drivers/gcs.md b/docs/storage-drivers/gcs.md
index 2c74f34c..32b1c6b3 100644
--- a/docs/storage-drivers/gcs.md
+++ b/docs/storage-drivers/gcs.md
@@ -72,4 +72,4 @@ An implementation of the `storagedriver.StorageDriver` interface which uses Goog
 
 **Note** Instead of a key file you can use [Google Application Default Credentials](https://developers.google.com/identity/protocols/application-default-credentials).
 
-`rootdirectory`: (optional) The root directory tree in which all registry files are stored. Defaults to the empty string (bucket root).
+`rootdirectory`: (optional) The root directory tree in which all registry files are stored. Defaults to the empty string (bucket root). If a prefix is used, the path `bucketname/<prefix>` has to be pre-created before starting the registry.