diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000..1c418bb5a1
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "htdocs/mathjax"]
+	path = htdocs/mathjax
+	url = https://github.com/mathjax/MathJax.git
diff --git a/htdocs/mathjax b/htdocs/mathjax
new file mode 160000
index 0000000000..5612b3f296
--- /dev/null
+++ b/htdocs/mathjax
@@ -0,0 +1 @@
+Subproject commit 5612b3f296f44d56e433358164e0cdf281d42e16