diff --git a/code_style.md b/code_style.md
index f0eca75ffc..29e54057f8 100644
--- a/code_style.md
+++ b/code_style.md
@@ -74,20 +74,20 @@ General Style
   treat yourself to another `var`:
 
   ```javascript
-  var key = "foo",
+  const key = "foo",
       comparator = function(x, y) {
           return x - y;
       }; // Bad
 
-  var key = "foo";
-  var comparator = function(x, y) {
+  const key = "foo";
+  const comparator = function(x, y) {
       return x - y;
   }; // Good
 
-  var x = 0, y = 0; // Fine
+  let x = 0, y = 0; // Fine
 
-  var x = 0;
-  var y = 0; // Also fine
+  let x = 0;
+  let y = 0; // Also fine
   ```
 - A single line `if` is fine, all others have braces. This prevents errors when adding to the code.: