diff --git a/.gitmodules b/.gitmodules
index 40bff20..da02957 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "external/DebugLog"]
 	path = external/DebugLog
 	url = https://github.com/hideakitai/DebugLog.git
+[submodule "external/ArxTypeTraits"]
+	path = external/ArxTypeTraits
+	url = https://github.com/hideakitai/ArxTypeTraits.git
diff --git a/external/ArxTypeTraits b/external/ArxTypeTraits
new file mode 160000
index 0000000..702de9c
--- /dev/null
+++ b/external/ArxTypeTraits
@@ -0,0 +1 @@
+Subproject commit 702de9cc59c7e047cdc169ae3547718b289d2c02