diff --git a/modules/docs/src/Volo.Docs.Web/Areas/Documents/TagHelpers/TreeTagHelper.cs b/modules/docs/src/Volo.Docs.Web/Areas/Documents/TagHelpers/TreeTagHelper.cs
index f518d30a29..547fce39a7 100644
--- a/modules/docs/src/Volo.Docs.Web/Areas/Documents/TagHelpers/TreeTagHelper.cs
+++ b/modules/docs/src/Volo.Docs.Web/Areas/Documents/TagHelpers/TreeTagHelper.cs
@@ -137,7 +137,7 @@ namespace Volo.Docs.Areas.Documents.TagHelpers
                     }
                     else if (node.LastSignificantUpdateTime != null && node.LastSignificantUpdateTime + TimeSpan.FromDays(14) > DateTime.Now)
                     {
-                        var updBadge = sb.Append("<span class='badge badge-light ml-2' title=\"").Append(_localizer["UpdatedExplanation"]).Append(_localizer["Upd"]).Append("</span>");
+                        var updBadge = sb.Append("<span class='badge badge-light ml-2' title=\"").Append(_localizer["UpdatedExplanation"]).Append("\">").Append(_localizer["Upd"]).Append("</span>");
                         badgeStringBuilder.Append(updBadge);
                     }
                 }