diff --git a/docs/schema.md b/docs/schema.md
index 63e2dc87..abd3c27c 100644
--- a/docs/schema.md
+++ b/docs/schema.md
@@ -711,6 +711,28 @@ indicates whether Istio is enabled on the cluster.
 - `REQUIRED`: The app requires Istio to work properly.
 - `UNSUPPORTED`: The app does not support Istio.
 
+---
+
+### gcp
+
+Use this property to indicate GCP-specific app requirements.
+
+You can can specify [OAuth scopes](https://developers.google.com/identity/protocols/googlescopes)
+required by your application. The UI requires existing clusters to have the
+specified scopes in order to be selected, and also includes the specified
+scopes in cluster creation. Note that the "https://www.googleapis.com/auth/devstorage.read_only"
+(or other storage-reading scope) is required by default for pulling images
+from GCR.
+
+```yaml
+x-google-marketplace:
+  clusterConstraints:
+    gcp:
+      nodes:
+        requiredOauthScopes:
+        - https://www.googleapis.com/auth/cloud-platform.read-only
+```
+
 ## form
 
 ### help widget