data/samples/sample-book.adoc in asciidoctor-epub3-1.0.0.alpha.3 vs data/samples/sample-book.adoc in asciidoctor-epub3-1.5.0.alpha.4

@@ -4,9 +4,10 @@
 :doctype: book
 :producer: Asciidoctor
 :keywords: Asciidoctor, samples, e-book, EPUB3, KF8, MOBI, Asciidoctor.js
 :copyright: CC-BY-SA 3.0
 :imagesdir: images
+//:front-cover-image: image:front-cover.jpg[Front Cover,1050,1600]
 
 ifeval::["{scripts}" == "multilingual"]
 include::i18n.adoc[]
 endif::[]