diff --git a/lib/client-bundle-plugin.js b/lib/client-bundle-plugin.js
index 679b5e43..40fd6b31 100644
--- a/lib/client-bundle-plugin.js
+++ b/lib/client-bundle-plugin.js
@@ -37,7 +37,8 @@ export function getDependencies(clientOutput, item) {
   // Don't add self as dependency
   crawlDependencies.delete(item.fileName);
 
-  // Merge referencedFiles as regular deps.
+  // Merge referencedFiles as regular deps. They need to be in the same Set as
+  // some JS files might appear in both lists and need to be deduped too.
   //
   // Didn't do this as part of the main loop since their `chunk` can't have
   // nested deps and sometimes might be missing altogether, depending on type.