diff --git a/ui_framework/doc_site/webpack.config.js b/ui_framework/doc_site/webpack.config.js
index 05732bbca1ff9..749f1defc080b 100644
--- a/ui_framework/doc_site/webpack.config.js
+++ b/ui_framework/doc_site/webpack.config.js
@@ -18,6 +18,7 @@ module.exports = {
     ]
   },
 
+  // These are necessasry for using Enzyme with Webpack (https://github.com/airbnb/enzyme/blob/master/docs/guides/webpack.md).
   externals: {
     'react/lib/ExecutionEnvironment': true,
     'react/lib/ReactContext': true,