diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..9a1b1be
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "t/coreruleset"]
+	path = t/coreruleset
+	url = https://github.com/coreruleset/coreruleset.git
diff --git a/t/coreruleset b/t/coreruleset
new file mode 160000
index 0000000..31045f0
--- /dev/null
+++ b/t/coreruleset
@@ -0,0 +1 @@
+Subproject commit 31045f09c763bb2e0bd27a45dac26950320a61fe