diff --git a/README.md b/README.md
index 6cab8f9..385a567 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,6 @@ you'll need to restart this process regularly during development.
 ## Updating Open Sans
 
 To update the font files and CSS, run `google-font-downloader $FONT_CSS_URL`.
-As "documentation" `shell.nix` shows the internals, and
+As "documentation" `flake.nix` shows the internals, and
 `_includes/styles/typography.css` has a comment at the top that shows which
 command was used to generate it.