diff --git a/.gitmodules b/.gitmodules
index b2ab410..07d708c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "vendor/Catch"]
 	path = vendor/Catch
 	url = https://github.com/philsquared/Catch.git
+[submodule "vendor/spec"]
+	path = vendor/spec
+	url = https://github.com/mustache/spec.git
diff --git a/vendor/spec b/vendor/spec
new file mode 160000
index 0000000..bf6288e
--- /dev/null
+++ b/vendor/spec
@@ -0,0 +1 @@
+Subproject commit bf6288ed6bd0ce8ccea6f1dac070b3d779132c3b