diff --git a/api-ref/source/quotas.inc b/api-ref/source/quotas.inc
index 0571ff5bff..52b86a7655 100644
--- a/api-ref/source/quotas.inc
+++ b/api-ref/source/quotas.inc
@@ -76,7 +76,12 @@ Update resources quota for a specific project
 
 .. rest_method::  PUT /v1.0/{project_id}/mgmt/quotas/{user_project}
 
-Admin only action by default.
+Admin only action by default. Supported resources:
+
+* instances
+* backups
+
+If not set, use the default resource quota in Trove configuration.
 
 Normal response codes: 200
 
diff --git a/api-ref/source/samples/quota-update.json b/api-ref/source/samples/quota-update.json
index e838863247..5216c5c3be 100644
--- a/api-ref/source/samples/quota-update.json
+++ b/api-ref/source/samples/quota-update.json
@@ -1,5 +1,6 @@
 {
     "quotas": {
-        "instances": 20
+        "instances": 10,
+        "backups": 30
     }
 }
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