diff --git a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.md b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.md
index 035f3c80ee..32b65ff902 100644
--- a/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.md
+++ b/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.md
@@ -180,6 +180,12 @@ assert(telephoneCheck('(555-555-5555') === false);
 assert(telephoneCheck('(555)5(55?)-5555') === false);
 ```
 
+`telephoneCheck("55 55-55-555-5")` should return `false`.
+
+```js
+assert(telephoneCheck('55 55-55-555-5') === false);
+```
+
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