diff --git a/.travis.yml b/.travis.yml
index 7f625f663..d790e94f9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,9 +4,14 @@ before_install: >
   travis_retry sudo apt-get install python python-setuptools
   python-virtualenv python-dev gcc swig dialog libaugeas0 libssl-dev
 
-install: travis_retry python setup.py dev  # installs tox
+install:
+  - travis_retry python setup.py dev  # installs tox
+  - travis_retry pip install coveralls
+
 script: travis_retry tox
 
+after_success: coveralls
+
 env:
   - TOXENV=py26
   - TOXENV=py27
diff --git a/README.rst b/README.rst
index 277dbe9de..95f3cfa27 100644
--- a/README.rst
+++ b/README.rst
@@ -27,6 +27,8 @@ All you need to do is:
 
 .. image:: https://travis-ci.org/letsencrypt/lets-encrypt-preview.svg?branch=master
     :target: https://travis-ci.org/letsencrypt/lets-encrypt-preview
+.. image:: https://coveralls.io/repos/letsencrypt/lets-encrypt-preview/badge.svg?branch=master
+    :target: https://coveralls.io/r/letsencrypt/lets-encrypt-preview
 
 .. _watch demo video: https://www.youtube.com/watch?v=Gas_sSB-5SU