diff a/src/java.smartcardio/share/classes/javax/smartcardio/CardPermission.java b/src/java.smartcardio/share/classes/javax/smartcardio/CardPermission.java
--- a/src/java.smartcardio/share/classes/javax/smartcardio/CardPermission.java
+++ b/src/java.smartcardio/share/classes/javax/smartcardio/CardPermission.java
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 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
@@ -278,15 +278,28 @@
      */
     public int hashCode() {
         return getName().hashCode() + 31 * mask;
     }
 
+    /**
+     * Writes the state of this object to the stream.
+     *
+     * @param  s the {@code ObjectOutputStream} to which data is written
+     * @throws IOException if an I/O error occurs
+     */
     private void writeObject(ObjectOutputStream s) throws IOException {
         // Write out the actions. The superclass takes care of the name.
         s.defaultWriteObject();
     }
 
+    /**
+     * Restores the state of this object from the 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 void readObject(ObjectInputStream s)
             throws IOException, ClassNotFoundException {
         // Read in the actions, then restore the mask.
         s.defaultReadObject();
         mask = getMask(actions);
