diff --git a/src/ServiceControl/AuditLog.php b/src/ServiceControl/AuditLog.php
index 57b448f9b53..15d2cd41f27 100644
--- a/src/ServiceControl/AuditLog.php
+++ b/src/ServiceControl/AuditLog.php
@@ -33,6 +33,8 @@ class AuditLog extends \Google\Collection
   protected $authenticationInfoDataType = '';
   protected $authorizationInfoType = AuthorizationInfo::class;
   protected $authorizationInfoDataType = 'array';
+  protected $callerAgentType = CallerAgent::class;
+  protected $callerAgentDataType = '';
   /**
    * Other service-specific data about the request, response, and other
    * information associated with the current audited event.
@@ -173,6 +175,22 @@ public function getAuthorizationInfo()
   {
     return $this->authorizationInfo;
   }
+  /**
+   * Information set when the caller is an agent.
+   *
+   * @param CallerAgent $callerAgent
+   */
+  public function setCallerAgent(CallerAgent $callerAgent)
+  {
+    $this->callerAgent = $callerAgent;
+  }
+  /**
+   * @return CallerAgent
+   */
+  public function getCallerAgent()
+  {
+    return $this->callerAgent;
+  }
   /**
    * Other service-specific data about the request, response, and other
    * information associated with the current audited event.
diff --git a/src/ServiceControl/CallerAgent.php b/src/ServiceControl/CallerAgent.php
new file mode 100644
index 00000000000..caf67cf6f5f
--- /dev/null
+++ b/src/ServiceControl/CallerAgent.php
@@ -0,0 +1,62 @@
+<?php
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+namespace Google\Service\ServiceControl;
+
+class CallerAgent extends \Google\Model
+{
+  /**
+   * Default value. Should not be used.
+   */
+  public const AUTHORITY_AUTHORITY_TYPE_UNSPECIFIED = 'AUTHORITY_TYPE_UNSPECIFIED';
+  /**
+   * Acts under its own authority.
+   */
+  public const AUTHORITY_SELF = 'SELF';
+  /**
+   * Acts on behalf of another authority.
+   */
+  public const AUTHORITY_ON_BEHALF_OF = 'ON_BEHALF_OF';
+  /**
+   * The type of authority for the caller agent.
+   *
+   * @var string
+   */
+  public $authority;
+
+  /**
+   * The type of authority for the caller agent.
+   *
+   * Accepted values: AUTHORITY_TYPE_UNSPECIFIED, SELF, ON_BEHALF_OF
+   *
+   * @param self::AUTHORITY_* $authority
+   */
+  public function setAuthority($authority)
+  {
+    $this->authority = $authority;
+  }
+  /**
+   * @return self::AUTHORITY_*
+   */
+  public function getAuthority()
+  {
+    return $this->authority;
+  }
+}
+
+// Adding a class alias for backwards compatibility with the previous class name.
+class_alias(CallerAgent::class, 'Google_Service_ServiceControl_CallerAgent');