src/java.base/share/classes/java/io/InvalidClassException.java

@@ -35,10 +35,13 @@
   * <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>
+  * <LI> A {@linkplain Class#isValue()} value class implements {@linkplain Serializable}
+  *      but does not delegate to a serialization proxy using {@code writeReplace()}.
+  * <LI> A {@linkplain Class#isValue()} value class implements {@linkplain Externalizable}.
   * </UL>
   *
   * @since   1.1
   */
  public class InvalidClassException extends ObjectStreamException {