From d6cb3dc71ba0ff47ca028eb92c4d6e096e0d4f71 Mon Sep 17 00:00:00 2001
From: Florian Eckerstorfer <florian@eckerstorfer.co>
Date: Tue, 28 Apr 2015 21:36:38 +0200
Subject: [PATCH] Update docs for MappingConverter

---
 docs/converters.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/docs/converters.md b/docs/converters.md
index 04f4f7a..f925d15 100644
--- a/docs/converters.md
+++ b/docs/converters.md
@@ -55,6 +55,20 @@ $converter->addMapping(['qoo'], ['bar']);
 $converter->convert(['foo' => 'foobar', 'qoo' => 'qoobar']); // -> ['bar' => 'qoobar']
 ```
 
+If the `from` mapping is empty, the converter creates a new array and sets the item as `to` element in that array:
+
+```php
+$converter->addMappiong('', 'bar');
+$converter->convert('foobar'); // -> ['bar' => 'foobar']
+```
+
+In contrast, if the `to` mapping is empty the `from` value will returned as item.
+ 
+```php
+$converter->addMapping('bar', '');
+$converter->convert(['bar' => 'foobar'); // -> 'foobar'
+```
+
 
 FileGetContentsConverter
 ------------------------