diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..3362621
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "docs/external/doxygen-awesome-css"]
+	path = docs/external/doxygen-awesome-css
+	url = https://github.com/jothepro/doxygen-awesome-css
diff --git a/docs/external/doxygen-awesome-css b/docs/external/doxygen-awesome-css
new file mode 160000
index 0000000..1f36200
--- /dev/null
+++ b/docs/external/doxygen-awesome-css
@@ -0,0 +1 @@
+Subproject commit 1f3620084ff75734ed192101acf40e9dff01d848