diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..092c08a
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "contrib/glm"]
+	path = contrib/glm
+	url = git@github.com:g-truc/glm.git
diff --git a/contrib/glm b/contrib/glm
new file mode 160000
index 0000000..0af55cc
--- /dev/null
+++ b/contrib/glm
@@ -0,0 +1 @@
+Subproject commit 0af55ccecd98d4e5a8d1fad7de25ba429d60e863