diff --git a/pyproject.toml b/pyproject.toml
index f36e1c6..2e26b26 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,6 +46,8 @@ packages = [
     { include = "usp" }
 ]
 
+include = ["usp/py.typed"]
+
 [tool.poetry.dependencies]
 # Specify upper bound for locking
 python = ">=3.9,<4.0"
@@ -106,4 +108,4 @@ log_cli = true
 log_cli_level = "DEBUG"
 filterwarnings = [
     "error::pytest.PytestUnraisableExceptionWarning"
-]
\ No newline at end of file
+]
diff --git a/usp/py.typed b/usp/py.typed
new file mode 100644
index 0000000..e69de29