diff --git a/webui/src/web-components/demo/demo-framework/demo-runner.ts b/webui/src/web-components/demo/demo-framework/demo-runner.ts
index 680651b..2871929 100644
--- a/webui/src/web-components/demo/demo-framework/demo-runner.ts
+++ b/webui/src/web-components/demo/demo-framework/demo-runner.ts
@@ -96,6 +96,7 @@
       "sketch-diff-range-picker",
       "sketch-timeline",
       "sketch-timeline-message",
+      "sketch-external-message",
       "sketch-todo-panel",
       "sketch-tool-calls",
       "sketch-view-mode-select",