diff --git a/.gitmodules b/.gitmodules
index 9efe5b1ffe710..88424569dffa4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,7 @@
+[submodule "admin/tool/externaltaskmonitor"]
+	path = admin/tool/externaltaskmonitor
+	url = https://github.com/ucsf-education/tool_externaltaskmonitor
+	branch = MOODLE_403_DEVEL
 [submodule "admin/tool/ilioscategoryassignment"]
 	path = admin/tool/ilioscategoryassignment
 	url = https://github.com/ilios/tool_ilioscategoryassignment
@@ -144,7 +148,8 @@
 	path = theme/ucsf
 	url = https://github.com/ucsf-education/moodle-theme-ucsf
 	branch = MOODLE_403_DEVEL
-[submodule "admin/tool/externaltaskmonitor"]
-	path = admin/tool/externaltaskmonitor
-	url = https://github.com/ucsf-education/tool_externaltaskmonitor
-	branch = MOODLE_403_DEVEL
+[submodule "lib/editor/atto/plugins/fontsize"]
+	path = lib/editor/atto/plugins/fontsize
+	url = https://github.com/andrewnicols/moodle-atto_fontsize
+	branch = main
+	tag = v2023091901
diff --git a/lib/editor/atto/plugins/fontsize b/lib/editor/atto/plugins/fontsize
new file mode 160000
index 0000000000000..23858bb6670ab
--- /dev/null
+++ b/lib/editor/atto/plugins/fontsize
@@ -0,0 +1 @@
+Subproject commit 23858bb6670ab3fd02d8caab074b33df105cb559