diff --git a/index.js b/index.js
index 0961108..4cf7213 100644
--- a/index.js
+++ b/index.js
@@ -426,7 +426,7 @@ function questionMarks(list){
  * Return a list of tags for the given list of article ids
  * @param {Database} db - SQLite3 database instance
  * @param {Array<Number>} ids - a list of article ids
- * @returns {Array<Array>} A list of [article.id, tag.name] pairs
+ * @returns {Object} tags grouped by article.id
  */
 async function getTagsForArticles(db, ids) {
   const tags = db.prepare(`