diff --git a/.gitmodules b/.gitmodules
index a0a57f3d7..732fec7ca 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "vcpkg"]
 	path = vcpkg
 	url = https://github.com/microsoft/vcpkg.git
+[submodule "doxygen-awesome-css"]
+	path = doc/doxygen/theme
+	url = https://github.com/jothepro/doxygen-awesome-css.git
diff --git a/doc/doxygen/theme b/doc/doxygen/theme
new file mode 160000
index 000000000..1f3620084
--- /dev/null
+++ b/doc/doxygen/theme
@@ -0,0 +1 @@
+Subproject commit 1f3620084ff75734ed192101acf40e9dff01d848