diff --git a/.gitmodules b/.gitmodules
index e69de29b..cd0fc36e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tmk_core_custom"]
+	path = tmk_core_custom
+	url = https://github.com/kairyu/tmk_core_custom.git
diff --git a/tmk_core_custom b/tmk_core_custom
new file mode 160000
index 00000000..38f52c4a
--- /dev/null
+++ b/tmk_core_custom
@@ -0,0 +1 @@
+Subproject commit 38f52c4ae2410d59c5c82c7805d818169ace0aef