diff --git a/README.txt b/README.txt
index f014ec2..b009eca 100644
--- a/README.txt
+++ b/README.txt
@@ -1,4 +1,50 @@
 Introduction
 ============
 
+plone.formwidget.captcha is a z3c.form widget for use with Plone. It is
+a z3c.form re-implementation of the `collective.captcha` package written by
+Martijn Pieters.
 
+.. _collective.captcha: http://pypi.python.org/pypi/collective.captcha
+
+Buildout Installation
+---------------------
+
+Add the following code to your buildout.cfg to install plone.formwidget.captcha:
+
+[buildout]
+...
+eggs =
+    ...
+    plone.formwidget.captcha
+    ...
+
+...
+[instance]
+...
+zcml =
+    ...
+    plone.formwidget.captcha
+...
+
+
+Captchas without server state
+-----------------------------
+
+(From collective.captcha)
+
+A view to generate a captcha image and/or wav file, and to verify user input
+against it.
+
+A cookie is used to transfer state from one request to the next. The state is
+used, together with a server-side secret, to create a random string of
+characters, which in turn is displayed as a captcha image, or transformed to
+an audio file. Verification happens case-insensitively.
+
+Note that the captcha 'word' is only usable for 5-10 minutes, after which the
+view will not accept it any more. Moreover, a different word will be generated
+for a given session key every 5 minutes.
+
+This makes these captchas replayable for up to 10 minutes if a determined
+user keeps sending the same session id. Because of the server-secret though,
+captchas are not transferrable between sites.