--- old/src/share/classes/java/util/PropertyResourceBundle.java	2013-11-25 10:43:23.579257768 -0800
+++ new/src/share/classes/java/util/PropertyResourceBundle.java	2013-11-25 10:43:23.261253601 -0800
@@ -100,6 +100,11 @@
  * </blockquote>
  *
  * <p>
+ * The implementation of a {@code PropertyResourceBundle} subclass must be
+ * thread-safe if it's simultaneously used by multiple threads. The default
+ * implementations of the non-abstract methods in this class are thread-safe.
+ *
+ * <p>
  * <strong>Note:</strong> PropertyResourceBundle can be constructed either
  * from an InputStream or a Reader, which represents a property file.
  * Constructing a PropertyResourceBundle instance from an InputStream requires