diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..7af23d2
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,5 @@
+[submodule "input/popcorn"]
+	path = input/popcorn
+	url = ../../../ds-popcorn
+	datalad-id = 186d720c-0862-453d-8b94-5140f0d67d2e
+	datalad-url = ../ds-popcorn
diff --git a/input/popcorn b/input/popcorn
new file mode 160000
index 0000000..07ee160
--- /dev/null
+++ b/input/popcorn
@@ -0,0 +1 @@
+Subproject commit 07ee1605c38fbcd265afdd2a3f99cd9a551b2a6b