diff --git a/appcache.md b/appcache.md
index 6b144cc46..76676641f 100644
--- a/appcache.md
+++ b/appcache.md
@@ -1,17 +1,24 @@
 ---
 title: Appcache
 category: HTML
+layout: 2017/sheet
 ---
 
 ### Format
 
-    CACHE MANIFEST
-    # version
+```
+CACHE MANIFEST
+# version
 
-    CACHE:
-    http://www.google.com/jsapi
-    /assets/app.js
-    /assets/bg.png
+CACHE:
+http://www.google.com/jsapi
+/assets/app.js
+/assets/bg.png
 
-    NETWORK:
-    *
+NETWORK:
+*
+```
+
+Note that Appcache is deprecated!
+
+See: [Using the application cache](https://developer.mozilla.org/en-US/docs/Web/HTML/Using_the_application_cache) _(developer.mozilla.org)_