diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..be1e8e4
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "system/core"]
+	path = system/core
+	url = https://github.com/flarum/core.git
diff --git a/system/core b/system/core
new file mode 160000
index 0000000..023b8b9
--- /dev/null
+++ b/system/core
@@ -0,0 +1 @@
+Subproject commit 023b8b9a9c6feaeecaac4c08d503f76794545aec