diff --git a/.gitmodules b/.gitmodules
index 8b13789..c24a6f8 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1 +1,4 @@
 
+[submodule "ImGuiExternal/valve-bsp-parser"]
+	path = ImGuiExternal/valve-bsp-parser
+	url = https://github.com/ALittlePatate/valve-bsp-parser
diff --git a/ImGuiExternal/valve-bsp-parser b/ImGuiExternal/valve-bsp-parser
new file mode 160000
index 0000000..83bf4bd
--- /dev/null
+++ b/ImGuiExternal/valve-bsp-parser
@@ -0,0 +1 @@
+Subproject commit 83bf4bd0650bf373d11c8888f34d85b9e2c45902