diff --git a/.gitmodules b/.gitmodules
index 63c99cf337248..6f8f33597bdc7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -23,6 +23,11 @@
 	path = mod/facetoface
 	url = https://github.com/catalyst/moodle-mod_facetoface
 	branch = MOODLE_403_STABLE
+[submodule "course/format/topcoll"]
+	path = course/format/topcoll
+	url = https://github.com/gjb2048/moodle-format_topcoll
+	branch = MOODLE_403
+	tag = V403.1.1
 [submodule "mod/zoom"]
 	path = mod/zoom
 	url = https://github.com/ncstate-delta/moodle-mod_zoom
diff --git a/course/format/topcoll b/course/format/topcoll
new file mode 160000
index 0000000000000..88e978034c800
--- /dev/null
+++ b/course/format/topcoll
@@ -0,0 +1 @@
+Subproject commit 88e978034c800297b999d60606194ded8f72d668