Add motivation

README.md

@@ -4,7 +4,7 @@
 [![Coverage Status](https://coveralls.io/repos/kimmobrunfeldt/egtest/badge.png?branch=master)](https://coveralls.io/r/kimmobrunfeldt/egtest?branch=master)
 [![Badge fury](https://badge.fury.io/py/egtest.png)](https://badge.fury.io/py/egtest.png)
 
-Incorrect example is worse than no example at all. *E.g. test* parses code blocks from documentation, runs them and reports possible errors. Your examples can be written in any language.
+Incorrect example is worse than no example at all. *E.g. test* parses code blocks from documentation, runs them and reports possible errors. Your examples can be written in any language. There are similar projects but [they didn't suit my needs](#motivation).
 
 **Example**
 
@@ -101,6 +101,11 @@ It is possible to define custom code which will be injected on each example befo
 
 *Currently there's no sensible way to add custom injections without modifying [egtest/injecthooks.py](egtest/injecthooks.py).*
 
+
+## Motivation
+
+I wrote this to test [examples for Nap](https://github.com/kimmobrunfeldt/nap#examples), which is a convenience wrapper for *requests*. [Doctest](https://docs.python.org/2/library/doctest.html) has similar functionality but you need to start every line in example with `>>>`. It makes the example harder to follow. [Sphinx](http://sphinx-doc.org/) supports running examples like *egtest* does but Sphinx is a bit heavyweight and it supports only Python.
+
 ## Contributing
 
 [Documentation for Egtest developers](docs/)