diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..45e781a8
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "document/core/util/katex"]
+	path = document/core/util/katex
+	url = https://github.com/KaTeX/KaTeX/