diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..70a6342b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "docca"]
+	path = doc/docca
+	url = https://github.com/vinniefalco/docca.git
+    branch = .
diff --git a/doc/docca b/doc/docca
new file mode 160000
index 00000000..77a24a56
--- /dev/null
+++ b/doc/docca
@@ -0,0 +1 @@
+Subproject commit 77a24a56c68ebb158f7d605cc3d5546510002c1c