diff --git a/discovery/composer-v1beta1.json b/discovery/composer-v1beta1.json
index a67d758bc55..972c109945d 100644
--- a/discovery/composer-v1beta1.json
+++ b/discovery/composer-v1beta1.json
@@ -401,7 +401,7 @@
       }
     }
   },
-  "revision": "20200817",
+  "revision": "20200922",
   "rootUrl": "https://composer.googleapis.com/",
   "schemas": {
     "AllowedIpRange": {
@@ -822,7 +822,7 @@
           "type": "string"
         },
         "enablePrivateEnvironment": {
-          "description": "Optional. If `true`, a Private IP Cloud Composer environment is created. If this field is true, `use_ip_aliases` must be true.",
+          "description": "Optional. If `true`, a Private IP Cloud Composer environment is created. If this field is set to true, `IPAllocationPolicy.use_ip_aliases` must be set to true.",
           "type": "boolean"
         },
         "privateClusterConfig": {
diff --git a/src/apis/composer/v1beta1.ts b/src/apis/composer/v1beta1.ts
index 793371a4b1e..a3db4be77de 100644
--- a/src/apis/composer/v1beta1.ts
+++ b/src/apis/composer/v1beta1.ts
@@ -433,7 +433,7 @@ export namespace composer_v1beta1 {
      */
     cloudSqlIpv4CidrBlock?: string | null;
     /**
-     * Optional. If `true`, a Private IP Cloud Composer environment is created. If this field is true, `use_ip_aliases` must be true.
+     * Optional. If `true`, a Private IP Cloud Composer environment is created. If this field is set to true, `IPAllocationPolicy.use_ip_aliases` must be set to true.
      */
     enablePrivateEnvironment?: boolean | null;
     /**