diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..5a7fe33
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "verilog/rtl/ppcpu"]
+	path = verilog/rtl/ppcpu
+	url = https://github.com/piotro888/ppcpu.git
diff --git a/verilog/rtl/ppcpu b/verilog/rtl/ppcpu
new file mode 160000
index 0000000..74852c5
--- /dev/null
+++ b/verilog/rtl/ppcpu
@@ -0,0 +1 @@
+Subproject commit 74852c5bd5d19da93a92226665813b39263b2405