--- a/README	Thu Aug 30 19:50:39 2018 +0200
+++ b/README	Thu Aug 30 19:40:18 2018 +0200
@@ -79,6 +79,22 @@
     [extensions]
     evolve.serveronly =
 
+Extension Purpose
+=================
+
+The goal of this extension is to provide an appropriate place for code and
+concept related to changeset evolution to mature. In this extension we allow
+for hackier code, unlocking quick experimentation and faster iterations.
+
+In addition, the evolve extensions support a wider set of Mercurial version,
+allowing us to reach a larger user base for feedback. The Evolve extension is
+not tight to the Mercurial release cycle and can release new feature and bug
+fix at a higher rate if necessary.
+
+Once a concept is ready enough, its implementation is moved into Mercurial
+core. The maturation period helped us to get a clearer picture of what was
+needed. During the upstreaming process, we can use this clearer picture to
+clean up the code and upgrade it to an appropriate quality for Mercurial core.
 
 How to Contribute
 =================