diff --git a/user_doc.head.html b/user_doc.head.html
index 958a96910..eae673f5f 100644
--- a/user_doc.head.html
+++ b/user_doc.head.html
@@ -19,6 +19,7 @@ body
     top: 36px;
     bottom: 0;
     overflow-y: scroll;
+    -webkit-overflow-scrolling: touch; /* necessary for momentum scrolling */
 }
 
 .fish_left_bar