diff --git a/seed/challenges/basic-bonfires.json b/seed/challenges/basic-bonfires.json
index 8ecebec116..08c797f58c 100644
--- a/seed/challenges/basic-bonfires.json
+++ b/seed/challenges/basic-bonfires.json
@@ -990,7 +990,8 @@
         "expect(fearNotLetter('yz')).to.be.undefined;"
       ],
       "MDNlinks": [
-        "String.charCodeAt()"
+        "String.charCodeAt()",
+        "String.fromCharCode()"
       ],
       "challengeType": 5,
       "nameCn": "",