diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000000..e2a51467cb163
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "admin/tool/ilioscategoryassignment"]
+    path = admin/tool/ilioscategoryassignment
+    url = https://github.com/ilios/tool_ilioscategoryassignment.git
+    branch = MOODLE_404_STABLE
diff --git a/admin/tool/ilioscategoryassignment b/admin/tool/ilioscategoryassignment
new file mode 160000
index 0000000000000..e4fb8af9e2055
--- /dev/null
+++ b/admin/tool/ilioscategoryassignment
@@ -0,0 +1 @@
+Subproject commit e4fb8af9e2055b1c52d61762dc207f3ddd557f32