1 files changed, 3 insertions, 3 deletions
diff --git a/packages/gitbook/src/parse/walkSummary.js b/packages/gitbook/src/parse/walkSummary.js
index 47feb1f..046965b 100644
--- a/packages/gitbook/src/parse/walkSummary.js
+++ b/packages/gitbook/src/parse/walkSummary.js
@@ -8,9 +8,9 @@ const Promise = require('../utils/promise');
     @return {Promise}
 */
 function walkArticles(articles, fn) {
-    return Promise.forEach(articles, function(article) {
+    return Promise.forEach(articles, (article) => {
         return Promise(fn(article))
-        .then(function() {
+        .then(() => {
             return walkArticles(article.getArticles(), fn);
         });
     });
@@ -26,7 +26,7 @@ function walkArticles(articles, fn) {
 function walkSummary(summary, fn) {
     const parts = summary.getParts();
 
-    return Promise.forEach(parts, function(part) {
+    return Promise.forEach(parts, (part) => {
         return walkArticles(part.getArticles(), fn);
     });
 }