diff --git a/CHANGELOG.md b/CHANGELOG.md
index 593b7eb..bfb3a0c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 - Allow to use a custom class for the chart rendering via the `Chart(..., renderer_cls=MyClass)` keyword argument (see `examples/custom-renderer-class.py` for inspiration)
+- The module is is now PEP 561 compatible, and tested with `mypy`
 
 ### Changed
 - Fixed off-by-one shift when rendering empty lines on the Y-axis (the issue was visible only when the Y-axis was on the left side)
diff --git a/setup.cfg b/setup.cfg
index 9bdd681..c030123 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -45,6 +45,9 @@ packages = find:
 [options.packages.find]
 where = src
 
+[options.package_data]
+candlestick_chart = py.typed
+
 [options.entry_points]
 console_scripts =
     candlestick-chart = candlestick_chart.__main__:main
diff --git a/src/candlestick_chart/py.typed b/src/candlestick_chart/py.typed
new file mode 100644
index 0000000..e69de29