--- old/src/java.base/share/classes/java/nio/channels/ReadableByteChannel.java	2019-11-20 07:59:01.000000000 -0800
+++ new/src/java.base/share/classes/java/nio/channels/ReadableByteChannel.java	2019-11-20 07:59:00.000000000 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2001, 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
@@ -90,6 +90,9 @@
      * @throws  ClosedChannelException
      *          If this channel is closed
      *
+     * @throws  IllegalArgumentException
+     *          If the buffer is read-only
+     *
      * @throws  AsynchronousCloseException
      *          If another thread closes this channel
      *          while the read operation is in progress