README.md in tree_html-0.1.1 vs README.md in tree_html-0.1.2

@@ -18,9 +18,11 @@
 
     $ gem install tree_html
 
 ## Usage
 
-In Node class, `include TreeHtml`, then implement `label_for_tree_graph` and `children_for_tree_graph`, then call`tree_html` on node object to get ul/li fragment, or `tree_html_full` to get a html file with pre-defined style.
+In Node class, `include TreeHtml`, then implement `label_for_tree_html` and `children_for_tree_html`, then call`tree_html` on node object to get ul/li fragment, or `tree_html_full` to get a html file with pre-defined style.
+
+You may overwrite `css_for_tree_html` to specify your own style.
 
 Or checkout [test/tree_html_test.rb](https://github.com/turnon/tree_html/blob/master/test/tree_html_test.rb) to see how to use.