diff --git a/challenges/01-front-end-development-certification/basic-javascript.json b/challenges/01-front-end-development-certification/basic-javascript.json
index e368cebe7ea..83e0d43ccbd 100644
--- a/challenges/01-front-end-development-certification/basic-javascript.json
+++ b/challenges/01-front-end-development-certification/basic-javascript.json
@@ -4502,6 +4502,7 @@
         "For the given <code>id</code> in <code>collection</code>:",
         "If <code>value</code> is non-blank (<code>value !== \"\"</code>) and <code>prop</code> is not <code>\"tracks\"</code> then update or set the <code>value</code> for the <code>prop</code>.",
         "If the <code>prop</code> is <code>\"tracks\"</code> and <code>value</code> is non-blank, push the <code>value</code> onto the end of the <code>tracks</code> array.",
+        "If <code>\"tracks\"</code> is non-existent before you update it, create an empty array before pushing a track to it.",
         "If <code>value</code> is blank, delete that <code>prop</code>.",
         "Always return the entire collection object.",
         "<strong>Note</strong><br>Don't forget to use <code>bracket notation</code> when <a href=\"accessing-objects-properties-with-variables\" target=\"_blank\">accessing object properties with variables</a>."