README.textile in murlsh-0.10.0 vs README.textile in murlsh-0.11.0

@@ -82,6 +82,37 @@
 publish_url is where the notifications get sent
 subscribe_url is what gets put in the feed as link rel="hub"
 
 This will make updates to your feed show up in Google Reader instantly.
 
+h1. Thumbnail Locators
+
+If the url for a thumbnail image can be generated by regex search and replace
+on a posted url, a rule can be added to the configuration to automatically
+show a thumbnail image for it. The 'thumb_locators' config key is a hash
+of Javascript regex to Javascript replacement string (which can include
+captured groups). The hash key is wrapped in ^ and $ before compilation so
+it must match the entire url. The regex is compiled case-insensitive.
+
+For example:
+
+* Show the GitHub octocat Apple touch icon
+(http://github.com/apple-touch-icon.png) as a thumbnail for GitHub links
+* Show a friend's Gravatar for the thumbnails of links to his blog
+
+<pre>
+<code>
+thumb_locators:
+  (http:\/\/github\.com\/).*: $1apple-touch-icon.png
+  http:\/\/myfriend\.com\/.*: http://gravatar.com/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx</code>
+</pre>
+
+h1. Design Goals
+
+* make site fast and very cacheable, caching wrapper around calls to third party JSON APIs
+* low effort required to add a url, get metadata programatically instead of requiring user to specify
+* heavy lifting on the client side
+* allow customization with config and plugins
+* full regex search for finding saved urls
+* simple security (no sessions, no cookies)
+
 Questions and comments: "[e-mail]":mailto:[e-mail]