Index: E:/projects/clear/eclipse/workspace/luni/src/main/java/java/util/TimeZone.java
===================================================================
--- E:/projects/clear/eclipse/workspace/luni/src/main/java/java/util/TimeZone.java (revision 382626)
+++ E:/projects/clear/eclipse/workspace/luni/src/main/java/java/util/TimeZone.java (working copy)
@@ -27,6 +27,13 @@
* daylight savings time rules. Subclasses support a particular calendar type,
* such as the gregorian calendar.
*
+ * Please note the type returned by factory methods, i.e. getDefault()
+ * and getTimeZone(String), is implementation dependent, so that
+ * it may introduce serialization incompatibility issue between different implementation.
+ * Harmony returns instance of {@link SimpleTimeZone SimpleTimeZone} so that the
+ * bytes serialized by Harmony can be deserialized on other implementation successfully,
+ * but the reverse compatibility cannot be guaranteed.
+ *
* @see GregorianCalendar
* @see SimpleTimeZone
*/