diff --git a/docs/javascript.md b/docs/javascript.md
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--- a/docs/javascript.md
+++ b/docs/javascript.md
@@ -4,7 +4,7 @@ You can write micro:bit programs in a subset of [TypeScript](https://www.typescr
 Many micro:bit programs, especially at the beginner's level, are just plain JavaScript. TypeScript introduces class-based 
 object-oriented programming, such as:
 
-```js
+```typescript
 class Greeter {
     greeting: string;
     constructor(message: string) {
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