diff --git a/.gitmodules b/.gitmodules
index fc29b8c4..f281fbd6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "vgui-dev"]
 	path = vgui-dev
 	url = https://github.com/FWGS/vgui-dev
+[submodule "ref_gl/gl4es"]
+	path = ref_gl/gl4es
+	url = https://github.com/ptitSeb/gl4es
diff --git a/ref_gl/gl4es b/ref_gl/gl4es
new file mode 160000
index 00000000..d14be632
--- /dev/null
+++ b/ref_gl/gl4es
@@ -0,0 +1 @@
+Subproject commit d14be632a8dc6e15611c154d8ccc9e9da3967650