diff --git a/website/blog/2019-07-31-black.md b/website/blog/2019-07-31-black.md
index 5a57d4d6..c5e4242a 100644
--- a/website/blog/2019-07-31-black.md
+++ b/website/blog/2019-07-31-black.md
@@ -12,7 +12,7 @@ As part of adopting Black, all style checks in flake8 and pylint have been disab
 
 To make sure that all files are Black when you commit your changes, we are using [`pre-commit`](https://pre-commit.com/). The hook is automatically installed for new dev environments (as part of `script/setup`).
 
-If you have an existing developer installation, please run:
+If you have an existing developer installation, please run inside your virtual environment:
 
 ```
 pip install pre-commit