diff --git a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fcb156834128001ea945.md b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fcb156834128001ea945.md
index 67425590a93..84c24df2e82 100644
--- a/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fcb156834128001ea945.md
+++ b/curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-advanced-array-methods-by-building-a-statistics-calculator/6352fcb156834128001ea945.md
@@ -33,6 +33,12 @@ assert.match(getVariance.toString(), /sumSquaredDifferences\s*=\s*squaredDiffere
 
 Your `reduce` callback should return the sum of `acc` and `el`.
 
+```js
+assert.match(getVariance.toString(), /sumSquaredDifferences\s*=\s*squaredDifferences\.reduce\(\s*function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*return\s*acc\s*\+\s*el\s*;\s*\}/);
+```
+
+You are missing the starting value of the `reduce`.
+
 ```js
 assert.match(getVariance.toString(), /sumSquaredDifferences\s*=\s*squaredDifferences\.reduce\(\s*function\s*\(\s*acc\s*,\s*el\s*\)\s*\{\s*return\s*acc\s*\+\s*el\s*;\s*\}\s*,\s*0\s*\)/);
 ```