diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..971c349
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "spec"]
+	path = spec
+	url = ssh://git@gitea.pestctrl.io:2223/pestctrl/pegrep-spec.git
diff --git a/spec b/spec
new file mode 160000
index 0000000..eafcef5
--- /dev/null
+++ b/spec
@@ -0,0 +1 @@
+Subproject commit eafcef584dc70b90f99629c95eb0c7e2729ae3b3