diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..1e856fb
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "external/verilog-axi"]
+	path = external/verilog-axi
+	url = https://github.com/alexforencich/verilog-axi
diff --git a/external/verilog-axi b/external/verilog-axi
new file mode 160000
index 0000000..516bd5d
--- /dev/null
+++ b/external/verilog-axi
@@ -0,0 +1 @@
+Subproject commit 516bd5dadc3365b7f9e225d2af8fe0b8d804fe53