diff --git a/.gitignore b/.gitignore
index b0e734a..3c564c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,12 @@
 *.pyc
 *.sw?
 *~
 .coverage
 .eggs/
 __pycache__
 *.egg-info/
 build/
 dist/
 version.txt
 .tox
+.mypy_cache/
diff --git a/mypy.ini b/mypy.ini
new file mode 100644
index 0000000..46f8db8
--- /dev/null
+++ b/mypy.ini
@@ -0,0 +1,15 @@
+[mypy]
+namespace_packages = True
+warn_unused_ignores = True
+
+
+# 3rd party libraries without stubs (yet)
+
+[mypy-pkg_resources.*]
+ignore_missing_imports = True
+
+[mypy-pytest.*]
+ignore_missing_imports = True
+
+# [mypy-add_your_lib_here.*]
+# ignore_missing_imports = True
diff --git a/swh/dataset/py.typed b/swh/dataset/py.typed
new file mode 100644
index 0000000..1242d43
--- /dev/null
+++ b/swh/dataset/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561.