diff --git a/README.md b/README.md
index 45538e27..4d3d6933 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,11 @@ The setup script will create a new Python virtual environment for the applicatio
 
     source .venv/bin/activate
 
-If you want to automatically load the virtual environment whenever you enter the project directory, take a look at [direnv](https://direnv.net/).  An `.envrc` file is included in this repository.
+When you are done, type
+
+    deactivate
+
+If you want to automatically load the virtual environment whenever you enter the project directory, take a look at [direnv](https://direnv.net/).  An `.envrc` file is included in this repository.  direnv will activate and deactivate virtualenvs for you when you enter and leave the directory.
 
 ## Running (development)