Updated README

README.md

@@ -15,6 +15,7 @@ Schedule the asynchronous exectution of a function by calling `async` from withi
 ```python
 async(func,*args,hook=None,**kwargs)
 ```
+The optional hook function gets the finished task object as its first argument after execution
 
 ### Management commands
 

README.rst

@@ -28,6 +28,9 @@ from within your Django project.
 
     async(func,*args,hook=None,**kwargs)
 
+The optional hook function gets the finished task object as its first
+argument after execution
+
 Management commands
 ~~~~~~~~~~~~~~~~~~~