diff --git a/curriculum/challenges/english/25-front-end-development/workshop-library-manager/67116d7584d0b469b14579c3.md b/curriculum/challenges/english/25-front-end-development/workshop-library-manager/67116d7584d0b469b14579c3.md
index 6485299ca6e..e7b0483e1ff 100644
--- a/curriculum/challenges/english/25-front-end-development/workshop-library-manager/67116d7584d0b469b14579c3.md
+++ b/curriculum/challenges/english/25-front-end-development/workshop-library-manager/67116d7584d0b469b14579c3.md
@@ -30,7 +30,7 @@ assert.lengthOf(getBooksByAuthor, 2)
 Your `getBooksByAuthor` function should return an array.
 
 ```js
-assert.isArray(getBooksByAuthor(library))
+assert.isArray(getBooksByAuthor(library, ''));
 ```
 
 Your `getBooksByAuthor` function should use a higher order function. Ex. (`filter`, `map`, `reduce`).