diff --git a/README.md b/README.md
index 0692054..b209a9d 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ done by virtualenv activation inside Emacs.
 The main entry points are `pyvenv-activate`, which queries the user
 for a virtual environment directory to activate, and `pyvenv-workon`,
 which queries for a virtual environment in `$WORKON_HOME` (from
-virtualenvwrapper.sh).
+[virtualenvwrapper.sh](https://virtualenvwrapper.readthedocs.io/en/latest/)).
 
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