diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..82ca2ee
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1 @@
+include src/isd/py.typed
diff --git a/src/isd/py.typed b/src/isd/py.typed
new file mode 100644
index 0000000..e69de29