diff --git a/docs/source/development.md b/docs/source/development.md
index f9aec7e6..1fb52ea8 100644
--- a/docs/source/development.md
+++ b/docs/source/development.md
@@ -6,7 +6,7 @@ Information for contributors
 * Change current directory to the top level of your local Forest repository
 * Install Forest in editable mode along with development tools: `pip install -e ".[dev]"`
 * Run code style checks: `flake8`
-* Run type hint checks: `mypy -p forest`
+* Run type hint checks: `mypy`
 * Run test suite: `pytest`
 
 ### Documentation
diff --git a/mypy.ini b/mypy.ini
index fa9bffde..99811965 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1,5 +1,6 @@
 [mypy]
 mypy_path = src
+packages = forest
 python_version = 3.11
 
 [mypy-holidays]