docs

Author: globalchubby

README.md

@@ -131,17 +131,17 @@ expect(actionThree(3)).to.deep.equal({
 });
 ```
 
-### `handleAction(type, reducer | reducerMap, ?defaultState)`
+### `handleAction(type, reducer | reducerMap = Identity, ?defaultState)`
 
 ```js
 import { handleAction } from 'redux-actions';
 ```
 
 Wraps a reducer so that it only handles Flux Standard Actions of a certain type.
 
-If a single reducer is passed, it is used to handle both normal actions and failed actions. (A failed action is analogous to a rejected promise.) You can use this form if you know a certain type of action will never fail, like the increment example above.
+If a `reducer` function is passed, it is used to handle both normal actions and failed actions. (A failed action is analogous to a rejected promise.) You can use this form if you know a certain type of action will never fail, like the increment example above.
 
-Otherwise, you can specify separate reducers for `next()` and `throw()`. This API is inspired by the ES6 generator interface.
+Otherwise, you can specify separate reducers for `next()` and `throw()` using the `reducerMap` form. This API is inspired by the ES6 generator interface.
 
 ```js
 handleAction('FETCH_DATA', {
@@ -150,7 +150,9 @@ handleAction('FETCH_DATA', {
 });
 ```
 
-If either `next()` or `throw()` are `undefined` or `null`, then the identity function is used for that reducer.
+If either `next()` or `throw()` are `undefined` or `null`, then the identity function is used for that reducer. 
+
+If the reducer argument (`reducer | reducerMap`) is `undefined`, then the identity function is used.
 
 The optional third parameter specifies a default or initial state, which is used when `undefined` is passed to the reducer.