--- a/java.rst	Fri Dec 25 17:58:15 2015 +0200
+++ b/java.rst	Fri Dec 25 18:00:10 2015 +0200
@@ -197,6 +197,10 @@
 
   $ jmap -dump:format=b,file=heap.dump $PID
 
+With ``live`` option only reachable objects are dumped::
+
+  $ jmap -dump:live,format=b,file=heap.dump $PID
+
 Creating heap dump on OutOfMemory error.
 ========================================