diff --git a/.gitmodules b/.gitmodules
index c09da0b..e74e0ac 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "lib/catch"]
 	path = lib/catch
 	url = https://github.com/philsquared/Catch
+[submodule "lib/variant"]
+	path = lib/variant
+	url = https://github.com/mapbox/variant
diff --git a/lib/variant b/lib/variant
new file mode 160000
index 0000000..916139a
--- /dev/null
+++ b/lib/variant
@@ -0,0 +1 @@
+Subproject commit 916139a2e51e125816efce6e19d428385601273f