diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb27fd61..e252aa67 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+
+- **Type Hints**: Added `py.typed` marker for PEP 561 compliance, enabling type checkers (mypy, pyright) to recognize the package as typed when installed from PyPI.
+
 ## [0.2.0] - 2025-12-26
 
 ### Added
diff --git a/graphqomb/py.typed b/graphqomb/py.typed
new file mode 100644
index 00000000..e69de29b
diff --git a/pyproject.toml b/pyproject.toml
index f46be8ac..85cfbb40 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,6 +57,9 @@ dependencies = { file = ["requirements.txt"] }
 dev = { file = ["requirements-dev.txt"] }
 doc = { file = ["docs/requirements.txt"] }
 
+[tool.setuptools.package-data]
+graphqomb = ["py.typed"]
+
 [tool.ruff]
 target-version = "py39"
 line-length = 120