diff --git a/README.rst b/README.rst
index c32204333e9e70a980911c2346f55c9fcd2be76f..d20caa34aac45c044d076e9a4eaf84a1ebd1538e 100644
--- a/README.rst
+++ b/README.rst
@@ -10,8 +10,17 @@ Installation
 
 Of course, if you're familiar with Python development tools, you're welcome to install the module in a virtualenv, somewhere else, etc.
 
-Running tests
--------------
+Running all tests
+-----------------
+
+The project comes with a Tox configuration that defines all the tests we expect to pass, across all the different environments we support. To run them all, run::
+
+  tox
+
+The next sections describe how to run them standalone in your own development environment, for faster iteration or simpler isolation of problems.
+
+Running unit tests
+------------------
 
 Run::