diff --git a/MANIFEST.in b/MANIFEST.in
index d017d16ab..726c631e8 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -12,3 +12,6 @@ include tools/README.rst
 recursive-include test *.pem
 recursive-include test *.py
 recursive-include bson *.h
+include bson/py.typed
+include gridfs/py.typed
+include pymongo/py.typed
diff --git a/bson/py.typed b/bson/py.typed
new file mode 100644
index 000000000..0f4057061
--- /dev/null
+++ b/bson/py.typed
@@ -0,0 +1,2 @@
+# PEP-561 Support File.
+# "Package maintainers who wish to support type checking of their code MUST add a marker file named py.typed to their package supporting typing".
diff --git a/gridfs/py.typed b/gridfs/py.typed
new file mode 100644
index 000000000..0f4057061
--- /dev/null
+++ b/gridfs/py.typed
@@ -0,0 +1,2 @@
+# PEP-561 Support File.
+# "Package maintainers who wish to support type checking of their code MUST add a marker file named py.typed to their package supporting typing".
diff --git a/pymongo/py.typed b/pymongo/py.typed
new file mode 100644
index 000000000..0f4057061
--- /dev/null
+++ b/pymongo/py.typed
@@ -0,0 +1,2 @@
+# PEP-561 Support File.
+# "Package maintainers who wish to support type checking of their code MUST add a marker file named py.typed to their package supporting typing".