--- old/src/java.base/share/classes/java/io/InvalidClassException.java	2019-11-27 06:27:38.412000000 -0800
+++ new/src/java.base/share/classes/java/io/InvalidClassException.java	2019-11-27 06:27:38.172000000 -0800
@@ -33,6 +33,10 @@
  *      descriptor read from the stream
  * <LI> The class contains unknown datatypes
  * <LI> The class does not have an accessible no-arg constructor
+ * <LI> The ObjectStreamClass of an enum constant does not represent
+ * an enum type
+ * <LI> Other conditions given in the <cite>Java Object Serialization
+ * Specification</cite>
  * </UL>
  *
  * @author  unascribed