diff --git a/bootstrap/bootstrap.d.ts b/bootstrap/bootstrap.d.ts
index 3545eb3109..491eb30451 100644
--- a/bootstrap/bootstrap.d.ts
+++ b/bootstrap/bootstrap.d.ts
@@ -22,6 +22,7 @@ interface ModalOptionsBackdropString {
 
 interface ScrollSpyOptions {
     offset?: number;
+    target?: string;
 }
 
 interface TooltipOptions {