diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..a6127a7
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "source/prjxray"]
+	path = source/prjxray
+	url = git@github.com:SymbiFlow/prjxray
diff --git a/source/prjxray b/source/prjxray
new file mode 160000
index 0000000..78c47ab
--- /dev/null
+++ b/source/prjxray
@@ -0,0 +1 @@
+Subproject commit 78c47ab82b65ebd1878437a418f595ee14415076