doc: update README

jveski · Nov 14, 2015 · a4ad178 · a4ad178
1 parent 80f8d0e
commit a4ad178
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/README.md b/README.md
@@ -80,8 +80,12 @@ Sets `child_process` gid option.
 .gid(0)
 ```
 
-### .end(fn)
-Executes command and evaluates assertions. Callback is fired without arguments.
+### .end([fn])
+Executes command and evaluates assertions. `end()` will throw with no callback.
+Callback is fired with `fn(err, stdout, stderr)` :
+- `err`: null or the assert or process error
+- `stdout`: the output string 
+- `stderr`: the error string 
 ```javascript
 .end(callback_function)
 ```