diff --git a/Developer-Guide.md b/Developer-Guide.md
index 472a30b..fb54f60 100644
--- a/Developer-Guide.md
+++ b/Developer-Guide.md
@@ -40,13 +40,13 @@ as described below.
 The minimum requirements are:
 
 * Git
-* Python 2.6 or 2.7
+* Python 2.6 or 2.7 with the [`regex`](https://pypi.python.org/pypi/regex) module
 * Java 7 (JRE and JDK)
 * [PhantomJS](http://phantomjs.org/) 1.6 or higher
 * [Closure Linter](https://developers.google.com/closure/utilities/docs/linter_howto)
 
 The executables `git`, `gjslint`, `java`, `jar`, `python`, and `phantomjs`
-should be in your `PATH`.
+should be in your `PATH`.  To install the `regex` Python module, run `pip install regex`.
 
 Optionally, you can also install JSDoc 3. Installing JSDoc 3 is necessary
 if you want to run the full integration suite.