diff --git a/README.md b/README.md
index e74e6b7..d51042d 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ You'll need to rename the package from "mylib" to something sensible:
 
 ```sh
 git mv mylib newname
-sed -i '' -e 's/mylib/newname/' tests/* .projections.json .github/workflows/python-app.yml .envrc
+sed -i '' -e 's/mylib/newname/' tests/* .projections.json .github/workflows/python-app.yml .envrc pyproject.toml
 ```
 
 ## Choosing the Python version
diff --git a/pyproject.toml b/pyproject.toml
index 2908db2..6590060 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,6 @@
 [tool.ruff]
 line-length = 80
+src = [".", "mylib"]
 
 [tool.ruff.format]
 quote-style = "double"
\ No newline at end of file