diff --git a/MANIFEST.in b/MANIFEST.in
index 32546e7..1064137 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,4 @@
 include README.md
 include LICENSE
 include test-requirements.txt
+include sample_sheet/py.typed
diff --git a/sample_sheet/py.typed b/sample_sheet/py.typed
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/sample_sheet/py.typed
@@ -0,0 +1 @@
+