diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..3847d26
--- /dev/null
+++ b/.gitmodules
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+[submodule "doc/doxygen-awesome-css"]
+	path = doc/doxygen-awesome-css
+	url = https://github.com/jothepro/doxygen-awesome-css
diff --git a/doc/doxygen-awesome-css b/doc/doxygen-awesome-css
new file mode 160000
index 0000000..c01e51e
--- /dev/null
+++ b/doc/doxygen-awesome-css
@@ -0,0 +1 @@
+Subproject commit c01e51e461a5f0d45422aa21cdf4e50181d04a19