--- old/src/java.base/share/classes/java/nio/channels/FileChannel.java	2019-11-20 07:59:00.000000000 -0800
+++ new/src/java.base/share/classes/java/nio/channels/FileChannel.java	2019-11-20 07:59:00.000000000 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2019, 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
@@ -719,7 +719,7 @@
      *          size
      *
      * @throws  IllegalArgumentException
-     *          If the position is negative
+     *          If the position is negative or the buffer is read-only
      *
      * @throws  NonReadableChannelException
      *          If this channel was not opened for reading