diff --git a/js/src/forum/components/IndexPage.js b/js/src/forum/components/IndexPage.js
index 22d8eb456..7995f3565 100644
--- a/js/src/forum/components/IndexPage.js
+++ b/js/src/forum/components/IndexPage.js
@@ -29,6 +29,10 @@ export default class IndexPage extends Page {
       this.lastDiscussion = app.previous.get('discussion');
     }
 
+    // If the user is coming from the discussion list, then they have either
+    // just switched one of the parameters (filter, sort, search) or they
+    // probably want to refresh the results. We will clear the discussion list
+    // cache so that results are reloaded.
     if (app.previous.matches(IndexPage)) {
       app.discussions.clear();
     }