diff --git a/.gitmodules b/.gitmodules
index ddcd8c884f..b30006f0a7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -743,3 +743,8 @@
 	url = ../nowide.git
 	fetchRecurseSubmodules = on-demand
 	branch = .
+[submodule "docca"]
+	path = tools/docca
+	url = ../docca.git
+	fetchRecurseSubmodules = on-demand
+	branch = .
diff --git a/tools/docca b/tools/docca
new file mode 160000
index 0000000000..9bbf76d88b
--- /dev/null
+++ b/tools/docca
@@ -0,0 +1 @@
+Subproject commit 9bbf76d88b2f30f368b7ad836058a1e539430dce