diff --git a/.gitmodules b/.gitmodules
index 12dc229..ef8d617 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
-[submodule "patched-bios"]
-	path = patched-bios
-	url = https://github.com/n4ru/patched-bioses
+[submodule "patched-bios"]
+	path = patched-bios
+	url = https://github.com/n4ru/patched-bioses
+[submodule "tools/IVPrep"]
+	path = tools/IVPrep
+	url = https://github.com/n4ru/IVPrep
diff --git a/tools/IVPrep b/tools/IVPrep
new file mode 160000
index 0000000..de40d08
--- /dev/null
+++ b/tools/IVPrep
@@ -0,0 +1 @@
+Subproject commit de40d08e30ffc2a452282095aa03735107bf53dc