diff --git a/docs/source/tutorials/register-filters-tags.md b/docs/source/tutorials/register-filters-tags.md
index dc938a114..1b3bdfe4d 100644
--- a/docs/source/tutorials/register-filters-tags.md
+++ b/docs/source/tutorials/register-filters-tags.md
@@ -4,7 +4,7 @@ title: Register Filters/Tags
 
 ## Register Tags
 
-```javascript
+```typescript
 // Usage: {% upper name %}
 import { TagToken, Context, Emitter, TopLevelToken } from 'liquidjs'