diff --git a/src/main/java/org/opensearch/security/util/AuthTokenUtils.java b/src/main/java/org/opensearch/security/util/AuthTokenUtils.java
index 9839dd3fac..5638e1520e 100644
--- a/src/main/java/org/opensearch/security/util/AuthTokenUtils.java
+++ b/src/main/java/org/opensearch/security/util/AuthTokenUtils.java
@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 package org.opensearch.security.util;
 
 import org.opensearch.common.settings.Settings;