--- a/jdk/src/java.base/share/classes/java/util/Observable.java	Thu Mar 30 17:23:52 2017 +0000
+++ b/jdk/src/java.base/share/classes/java/util/Observable.java	Thu Mar 30 11:26:31 2017 -0700
@@ -69,6 +69,8 @@
  * {@link java.beans} package.  For reliable and ordered
  * messaging among threads, consider using one of the concurrent data
  * structures in the {@link java.util.concurrent} package.
+ * For reactive streams style programming, see the
+ * {@link java.util.concurrent.Flow} API.
  */
 @Deprecated(since="9")
 public class Observable {