diff --git a/site/docs/4.2/components/modal.md b/site/docs/4.2/components/modal.md
index e95a57b9cdf0..d470bc7d44d7 100644
--- a/site/docs/4.2/components/modal.md
+++ b/site/docs/4.2/components/modal.md
@@ -263,7 +263,7 @@ You can also create a scrollable modal that allows scroll the modal body by addi
 
 <!-- Modal -->
 <div class="modal fade" id="exampleModalScrollable" tabindex="-1" role="dialog" aria-labelledby="exampleModalScrollableTitle" aria-hidden="true">
-  <div class="modal-dialog" role="document">
+  <div class="modal-dialog modal-dialog-scrollable" role="document">
     <div class="modal-content">
       <div class="modal-header">
         <h5 class="modal-title" id="exampleModalScrollableTitle">Modal title</h5>