diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..0ec3a8b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tests/data/twitter-text-conformance"]
+	path = tests/data/twitter-text-conformance
+	url = git://github.com/mzsanford/twitter-text-conformance.git
diff --git a/tests/data/twitter-text-conformance b/tests/data/twitter-text-conformance
new file mode 160000
index 0000000..3ba7c45
--- /dev/null
+++ b/tests/data/twitter-text-conformance
@@ -0,0 +1 @@
+Subproject commit 3ba7c4591e2753e21aa6e122307f6de21847e6cc