diff --git a/scripts/filters/locals.js b/scripts/filters/locals.js
index 67bd121..44a5a2e 100644
--- a/scripts/filters/locals.js
+++ b/scripts/filters/locals.js
@@ -18,6 +18,7 @@ hexo.extend.filter.register('template_locals', locals => {
   locals.description = __('description') !== 'description' ? __('description') : config.description;
   locals.languages = [...i18n.languages];
   locals.languages.splice(locals.languages.indexOf('default'), 1);
+  // See https://github.com/hexojs/hexo/pull/4614
   page.lang = page.lang || page.language;
   // Creative Commons
   locals.ccURL = 'https://creativecommons.org/' + (theme.creative_commons.license === 'zero' ? 'publicdomain/zero/1.0/' : 'licenses/' + theme.creative_commons.license + '/4.0/') + (theme.creative_commons.language || '');
diff --git a/source/js/utils.js b/source/js/utils.js
index e451f64..4f542f6 100644
--- a/source/js/utils.js
+++ b/source/js/utils.js
@@ -86,6 +86,7 @@ NexT.utils = {
         const lines = element.querySelector('.code') || element.querySelector('code');
         const code = lines.innerText;
         if (navigator.clipboard) {
+          // https://caniuse.com/mdn-api_clipboard_writetext
           navigator.clipboard.writeText(code).then(() => {
             button.querySelector('i').className = 'fa fa-check-circle fa-fw';
           }, () => {