chore: add explanatory comment to UpdateHandler

Change-Id: Iac140280024378a272e8b5ecff5da3dcc4062ae3
diff --git a/src/contentScripts/communityConsole/updateHandler/index.js b/src/contentScripts/communityConsole/updateHandler/index.js
index 8eaa815..b976b24 100644
--- a/src/contentScripts/communityConsole/updateHandler/index.js
+++ b/src/contentScripts/communityConsole/updateHandler/index.js
@@ -5,6 +5,8 @@
 
 export default class UpdateHandler {
   constructor() {
+    // The extension was just updated, so we need to start everything from
+    // scratch.
     new MWI18nServer();
     injectScript(chrome.runtime.getURL('updateHandlerLitComponents.bundle.js'));
     this.updateBanner = new UpdateBanner();