update action docs & link

lukeed · Dec 24, 2017 · 112349a · 112349a
1 parent 759a945
commit 112349a
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/readme.md b/readme.md
@@ -237,10 +237,12 @@ Type: `Function`
 
 The function to run when the current Command is executed.
 
-Its parameters are based on your [`usage`](#usage) definition.
+Its parameters are based (positionally) on your Command's [`usage`](#usage-1) definition.
 
 All options, flags, and extra/unknown values are included as the last parameter.
 
+> **Note:** Optional arguments are also passed as parameters & may be `undefined`!
+
 ```js
 sade('foo')
   .command('cp <src> <dest>')