diff --git a/.gitmodules b/.gitmodules
index 3c8c80d..ddf7997 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -79,3 +79,6 @@
 [submodule "plugins/gratitude"]
 	path = plugins/gratitude
 	url = https://github.com/BlythT/Gratitude-Millennium-Plugin
+[submodule "plugins/protondb"]
+	path = plugins/protondb
+	url = https://github.com/unicxrn/protondb-millennium
diff --git a/plugins/protondb b/plugins/protondb
new file mode 160000
index 0000000..7913678
--- /dev/null
+++ b/plugins/protondb
@@ -0,0 +1 @@
+Subproject commit 7913678dca9592b28d2f619aeefd47b06ebf36a2