diff --git a/docs/src/api/class-tracing.md b/docs/src/api/class-tracing.md
index 1cb2e5e01e..40624f49e8 100644
--- a/docs/src/api/class-tracing.md
+++ b/docs/src/api/class-tracing.md
@@ -128,7 +128,7 @@ a timeline preview.
 Whether to capture DOM snapshot on every action.
 
 ### option: Tracing.start.sources
-* langs: js
+* langs: js, csharp
 - `sources` <[boolean]>
 
 Whether to include source files for trace actions.