diff --git a/common/header.html b/common/header.html
index ffbd187..1004203 100644
--- a/common/header.html
+++ b/common/header.html
@@ -379,6 +379,8 @@
     });
 
     api.modifyClass("controller:composer", {
+      pluginId: "DiscoTOC",
+
       actions: {
         insertDtoc() {
           this.get("toolbarEvent").applySurround(