diff --git a/js/src/popover.js b/js/src/popover.js
index 7e8ec42975d4..86b664717309 100644
--- a/js/src/popover.js
+++ b/js/src/popover.js
@@ -34,7 +34,7 @@ const Popover = (($) => {
   })
 
   const DefaultType = $.extend({}, Tooltip.DefaultType, {
-    content : '(string|element|function)'
+    content : '(string|element|function|number)'
   })
 
   const ClassName = {