diff --git a/README.md b/README.md
index 13c87e87..be0569da 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,5 @@ css-layout
 ==========
 
 This project implements a subset of CSS including flexbox and the box model using pure JavaScript. The goal is to have a small standalone library to layout elements. It doesn't rely on the DOM at all.
+
+In order to make sure that the code is correct, it is developped using TDD where each commit adds a unit test and the associated code to make it work. All the unit tests are tested against Chrome's implementation of CSS.