--- a/src/java.base/share/classes/java/nio/channels/DatagramChannel.java	Fri Nov 22 17:20:43 2019 +0100
+++ b/src/java.base/share/classes/java/nio/channels/DatagramChannel.java	Fri Nov 22 09:00:16 2019 -0800
@@ -403,6 +403,9 @@
      *          or {@code null} if this channel is in non-blocking mode
      *          and no datagram was immediately available
      *
+     * @throws  IllegalArgumentException
+     *          If the buffer is read-only
+     *
      * @throws  ClosedChannelException
      *          If this channel is closed
      *