diff --git a/seed_data/challenges/basic-bonfires.json b/seed_data/challenges/basic-bonfires.json
index 3773c4da22..e65268b535 100644
--- a/seed_data/challenges/basic-bonfires.json
+++ b/seed_data/challenges/basic-bonfires.json
@@ -966,7 +966,8 @@
         "expect(fearNotLetter('yz')).to.be.undefined;"
       ],
       "MDNlinks": [
-        "String.charCodeAt()"
+        "String.charCodeAt()",
+        "String.fromCharCode()"
       ],
       "challengeType": 5,
       "nameCn": "",