Readme.md in parallel_tests-0.9.3 vs Readme.md in parallel_tests-0.9.4

@@ -63,20 +63,30 @@
 
     843 examples, 0 failures, 1 pending
 
     Took 29.925333 seconds
 
+### Run an arbitrary task in parallel
+```Bash
+RAILS_ENV=test parallel_test -e "rake my:custom:task"
+# or
+rake parallel:rake[my:custom:task]
+```
+
+
 Running things once
 ===================
 
 ```Ruby
 # effected by race-condition: first process may boot slower the second
 # either sleep a bit or use a lock for example File.lock
 ParallelTests.first_process? ? do_something : sleep(1)
 
 at_exit do
-  ParallelTests.wait_for_other_processes_to_finish
-  undo_something
+  if ParallelTests.first_process?
+    ParallelTests.wait_for_other_processes_to_finish
+    undo_something
+  end
 end
 ```
 
 Loggers
 ===================