diff --git a/.gitmodules b/.gitmodules
index c5aa18f..fc07c3f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -118,3 +118,8 @@
 	url = https://cau-gin.brainminds.riken.jp/brainminds/MTI-R01_0080
 	datalad-id = 46a4b86f-6d8f-4a4e-96d8-ab7f96009ed7
 	datalad-url = https://cau-gin.brainminds.riken.jp/brainminds/MTI-R01_0080
+[submodule "MTI-R01_0081"]
+	path = MTI-R01_0081
+	url = https://cau-gin.brainminds.riken.jp/brainminds/MTI-R01_0081
+	datalad-id = 7b030df5-1074-4c53-b88c-feabcd29e2bf
+	datalad-url = https://cau-gin.brainminds.riken.jp/brainminds/MTI-R01_0081
diff --git a/MTI-R01_0081 b/MTI-R01_0081
new file mode 160000
index 0000000..56b091f
--- /dev/null
+++ b/MTI-R01_0081
@@ -0,0 +1 @@
+Subproject commit 56b091fa664fead48f2d37f182bfc97dc200a6b8