diff --git a/layouts/index.json b/layouts/index.json
index a3cd793..573cc1d 100644
--- a/layouts/index.json
+++ b/layouts/index.json
@@ -23,6 +23,7 @@
 				{{- $s := replace $s "\\u0026" "&" }}
 				"content_html": {{ $s }},
 				"date_published": "{{ .Date.Format "2006-01-02T15:04:05-07:00" }}",
+		                "date_modified": "{{ .Lastmod | time.Format  "2006-01-02T15:04:05-07:00" }}",
 				"url": "{{ .Permalink }}"
 				{{- with .Params.categories -}}
 				,