--- a/src/java.base/share/classes/java/lang/Enum.java	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/java.base/share/classes/java/lang/Enum.java	Thu Oct 17 20:53:35 2019 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 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
@@ -59,6 +59,8 @@
  * @see     Class#getEnumConstants()
  * @see     java.util.EnumSet
  * @see     java.util.EnumMap
+ * @jls 8.9 Enum Types
+ * @jls 8.9.3 Enum Members
  * @since   1.5
  */
 @SuppressWarnings("serial") // No serialVersionUID needed due to
@@ -273,17 +275,19 @@
     /**
      * prevent default deserialization
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream in) throws IOException,
         ClassNotFoundException {
         throw new InvalidObjectException("can't deserialize enum");
     }
 
+    @java.io.Serial
     private void readObjectNoData() throws ObjectStreamException {
         throw new InvalidObjectException("can't deserialize enum");
     }
 
     /**
-     * A <a href="package-summary.html#nominal">nominal descriptor</a> for an
+     * A <a href="{@docRoot}/java.base/java/lang/constant/package-summary.html#nominal">nominal descriptor</a> for an
      * {@code enum} constant.
      *
      * @param <E> the type of the enum constant