diff --git a/guide/english/certifications/javascript-algorithms-and-data-structures/es6/explore-differences-between-the-var-and-let-keywords/index.md b/guide/english/certifications/javascript-algorithms-and-data-structures/es6/explore-differences-between-the-var-and-let-keywords/index.md
index 7690963107..86ed725852 100644
--- a/guide/english/certifications/javascript-algorithms-and-data-structures/es6/explore-differences-between-the-var-and-let-keywords/index.md
+++ b/guide/english/certifications/javascript-algorithms-and-data-structures/es6/explore-differences-between-the-var-and-let-keywords/index.md
@@ -1,9 +1,7 @@
---
title: Explore Differences Between the var and let Keywords
---
-
-
- Remember to use **`Read-Search-Ask`** if you get stuck. Try to pair program  and write your own code 
+ Remember to use **`Read-Search-Ask`** if you get stuck. Try to pair program  and write your own code 
### Problem Explanation:
@@ -34,7 +32,7 @@ We need to change each `var` to `let` in our code.
}
catTalk();
```
- Run Code
+ [Run code at codepen.io](https://codepen.io/dylantyates/pen/eKqoGY)
# Code Explanation:
@@ -42,15 +40,7 @@ By using `let` instead of `var` we can avoid overriding `catName` and `quote`.
#### Relevant Links
-* var
-* let
+- ["var" - *MDN JavaScript reference*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/var)
+- ["let" - *MDN JavaScript reference*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let)
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-
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-
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