diff --git a/docs/api/desktop-capturer.md b/docs/api/desktop-capturer.md
index 590895ce4f1..5cc233e6cd9 100644
--- a/docs/api/desktop-capturer.md
+++ b/docs/api/desktop-capturer.md
@@ -51,7 +51,7 @@ To capture both audio and video from the entire desktop the constraints passed
 to [`navigator.mediaDevices.getUserMedia`] must include `chromeMediaSource: 'desktop'`,
 for both `audio` and `video`, but should not include a `chromeMediaSourceId` constraint.
 
-```
+```javascript
 const constraints = {
   audio: {
     mandatory: {