README.md in jekyll-theme-puzzleduck-1.2.0 vs README.md in jekyll-theme-puzzleduck-2.1.0

@@ -37,9 +37,13 @@
 - android_username
 - copyright_name
 - copyright_email
 - source_url
 
+For each post the following should be provided in the front matter
+
+- title-image (an image from /assets/img/)
+
 
 ## Development
 
 ```bash
 git clone https://github.com/PuZZleDucK/jekyll-theme-puzzleduck.git