diff --git a/discovery/iap-v1.json b/discovery/iap-v1.json
index b3f56f284c..e780e6e023 100644
--- a/discovery/iap-v1.json
+++ b/discovery/iap-v1.json
@@ -682,7 +682,7 @@
       }
     }
   },
-  "revision": "20231229",
+  "revision": "20240126",
   "rootUrl": "https://iap.googleapis.com/",
   "schemas": {
     "AccessDeniedPageSettings": {
@@ -826,7 +826,7 @@
           "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/discovery/iap-v1beta1.json b/discovery/iap-v1beta1.json
index cee453f18f..9fd05a72a8 100644
--- a/discovery/iap-v1beta1.json
+++ b/discovery/iap-v1beta1.json
@@ -194,7 +194,7 @@
       }
     }
   },
-  "revision": "20231215",
+  "revision": "20240126",
   "rootUrl": "https://iap.googleapis.com/",
   "schemas": {
     "Binding": {
@@ -213,7 +213,7 @@
           "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/iap/v1.ts b/src/apis/iap/v1.ts
index 274b3f7450..3f56889e44 100644
--- a/src/apis/iap/v1.ts
+++ b/src/apis/iap/v1.ts
@@ -236,7 +236,7 @@ export namespace iap_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;
   }
diff --git a/src/apis/iap/v1beta1.ts b/src/apis/iap/v1beta1.ts
index c079567731..8f4c476afc 100644
--- a/src/apis/iap/v1beta1.ts
+++ b/src/apis/iap/v1beta1.ts
@@ -137,7 +137,7 @@ export namespace iap_v1beta1 {
      */
     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;
   }