diff --git a/discovery/cloudbilling-v1.json b/discovery/cloudbilling-v1.json
index 80fb796c02..265a494c75 100644
--- a/discovery/cloudbilling-v1.json
+++ b/discovery/cloudbilling-v1.json
@@ -121,7 +121,7 @@
           "parameterOrder": [],
           "parameters": {
             "parent": {
-              "description": "Optional. The parent to create a billing account from. Format: - `organizations/{organization_id}`, for example, `organizations/12345678` - `billingAccounts/{billing_account_id}`, for example, `billingAccounts/012345-567890-ABCDEF`",
+              "description": "Optional. The parent to create a billing account from. Format: - `billingAccounts/{billing_account_id}`, for example, `billingAccounts/012345-567890-ABCDEF`",
               "location": "query",
               "type": "string"
             }
@@ -416,7 +416,7 @@
               ],
               "parameters": {
                 "parent": {
-                  "description": "Optional. The parent to create a billing account from. Format: - `organizations/{organization_id}`, for example, `organizations/12345678` - `billingAccounts/{billing_account_id}`, for example, `billingAccounts/012345-567890-ABCDEF`",
+                  "description": "Optional. The parent to create a billing account from. Format: - `billingAccounts/{billing_account_id}`, for example, `billingAccounts/012345-567890-ABCDEF`",
                   "location": "path",
                   "pattern": "^billingAccounts/[^/]+$",
                   "required": true,
@@ -496,7 +496,7 @@
               ],
               "parameters": {
                 "parent": {
-                  "description": "Optional. The parent to create a billing account from. Format: - `organizations/{organization_id}`, for example, `organizations/12345678` - `billingAccounts/{billing_account_id}`, for example, `billingAccounts/012345-567890-ABCDEF`",
+                  "description": "Optional. The parent to create a billing account from. Format: - `billingAccounts/{billing_account_id}`, for example, `billingAccounts/012345-567890-ABCDEF`",
                   "location": "path",
                   "pattern": "^organizations/[^/]+$",
                   "required": true,
@@ -751,7 +751,7 @@
       }
     }
   },
-  "revision": "20231215",
+  "revision": "20240126",
   "rootUrl": "https://cloudbilling.googleapis.com/",
   "schemas": {
     "AggregationInfo": {
@@ -886,7 +886,7 @@
           "type": "array"
         },
         "role": {
-          "description": "Role that is assigned to the list of `members`, or principals. For example, `roles/viewer`, `roles/editor`, or `roles/owner`.",
+          "description": "Role that is assigned to the list of `members`, or principals. For example, `roles/viewer`, `roles/editor`, or `roles/owner`. For an overview of the IAM roles and permissions, see the [IAM documentation](https://cloud.google.com/iam/docs/roles-overview). For a list of the available pre-defined roles, see [here](https://cloud.google.com/iam/docs/understanding-roles).",
           "type": "string"
         }
       },
diff --git a/src/apis/cloudbilling/v1.ts b/src/apis/cloudbilling/v1.ts
index 95450e1bcc..904b94036d 100644
--- a/src/apis/cloudbilling/v1.ts
+++ b/src/apis/cloudbilling/v1.ts
@@ -205,7 +205,7 @@ export namespace cloudbilling_v1 {
      */
     members?: string[] | null;
     /**
-     * Role that is assigned to the list of `members`, or principals. For example, `roles/viewer`, `roles/editor`, or `roles/owner`.
+     * Role that is assigned to the list of `members`, or principals. For example, `roles/viewer`, `roles/editor`, or `roles/owner`. For an overview of the IAM roles and permissions, see the [IAM documentation](https://cloud.google.com/iam/docs/roles-overview). For a list of the available pre-defined roles, see [here](https://cloud.google.com/iam/docs/understanding-roles).
      */
     role?: string | null;
   }
@@ -1260,7 +1260,7 @@ export namespace cloudbilling_v1 {
   export interface Params$Resource$Billingaccounts$Create
     extends StandardParameters {
     /**
-     * Optional. The parent to create a billing account from. Format: - `organizations/{organization_id\}`, for example, `organizations/12345678` - `billingAccounts/{billing_account_id\}`, for example, `billingAccounts/012345-567890-ABCDEF`
+     * Optional. The parent to create a billing account from. Format: - `billingAccounts/{billing_account_id\}`, for example, `billingAccounts/012345-567890-ABCDEF`
      */
     parent?: string;
 
@@ -1669,7 +1669,7 @@ export namespace cloudbilling_v1 {
   export interface Params$Resource$Billingaccounts$Subaccounts$Create
     extends StandardParameters {
     /**
-     * Optional. The parent to create a billing account from. Format: - `organizations/{organization_id\}`, for example, `organizations/12345678` - `billingAccounts/{billing_account_id\}`, for example, `billingAccounts/012345-567890-ABCDEF`
+     * Optional. The parent to create a billing account from. Format: - `billingAccounts/{billing_account_id\}`, for example, `billingAccounts/012345-567890-ABCDEF`
      */
     parent?: string;
 
@@ -1987,7 +1987,7 @@ export namespace cloudbilling_v1 {
   export interface Params$Resource$Organizations$Billingaccounts$Create
     extends StandardParameters {
     /**
-     * Optional. The parent to create a billing account from. Format: - `organizations/{organization_id\}`, for example, `organizations/12345678` - `billingAccounts/{billing_account_id\}`, for example, `billingAccounts/012345-567890-ABCDEF`
+     * Optional. The parent to create a billing account from. Format: - `billingAccounts/{billing_account_id\}`, for example, `billingAccounts/012345-567890-ABCDEF`
      */
     parent?: string;