diff --git a/types/sarif/index.d.ts b/types/sarif/index.d.ts
index 322aa0a555..0254c62c50 100644
--- a/types/sarif/index.d.ts
+++ b/types/sarif/index.d.ts
@@ -1898,7 +1898,7 @@ export namespace Suppression {
 }
 
 /**
- * TBD
+ * A set of threadFlowsLocations which together describe the progress of a program through a thread of execution.
  */
 export interface ThreadFlow {
     /**