diff a/src/java.security.jgss/share/classes/javax/security/auth/kerberos/DelegationPermission.java b/src/java.security.jgss/share/classes/javax/security/auth/kerberos/DelegationPermission.java
--- a/src/java.security.jgss/share/classes/javax/security/auth/kerberos/DelegationPermission.java
+++ b/src/java.security.jgss/share/classes/javax/security/auth/kerberos/DelegationPermission.java
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
@@ -216,20 +216,27 @@
 
     /**
      * WriteObject is called to save the state of the DelegationPermission
      * to a stream. The actions are serialized, and the superclass
      * takes care of the name.
+     *
+     * @param  s the {@code ObjectOutputStream} to which data is written
+     * @throws IOException if an I/O error occurs
      */
     private synchronized void writeObject(java.io.ObjectOutputStream s)
         throws IOException
     {
         s.defaultWriteObject();
     }
 
     /**
      * readObject is called to restore the state of the
      * DelegationPermission from a stream.
+     *
+     * @param  s the {@code ObjectInputStream} from which data is read
+     * @throws IOException if an I/O error occurs
+     * @throws ClassNotFoundException if a serialized class cannot be loaded
      */
     private synchronized void readObject(java.io.ObjectInputStream s)
          throws IOException, ClassNotFoundException
     {
         // Read in the action, then initialize the rest
