README.md in jekyll-linkpreview-0.1.0 vs README.md in jekyll-linkpreview-0.2.0

@@ -1,11 +1,24 @@
 # Jekyll::Linkpreview
 
 Jekyll plugin to generate link preview by `{% linkpreview %}` tag. The plugin fetches [Open Graph protocols](http://ogp.me/) of the designated page to generate preview. The og properties are saved as JSON for caching and it is used when rebuilding the site.
 
-For example, `{% linkpreview https://github.com %}` tag generates following HTML when you run `jekyll build`,
+You can pass url directly to the tag, 
 
+```
+{% linkpreview https://github.com %}
+```
+
+or, can pass a url variable.
+
+```
+{% assign github_toppage = 'https://github.com'%}
+{% linkpreview github_toppage %}
+```
+
+The tag above generates following HTML when you run `jekyll build`,
+
 ```html
 <div class="jekyll-linkpreview-wrapper">
   <p><a href="https://github.com" target="_blank">https://github.com</a></p>
   <div class="jekyll-linkpreview-wrapper-inner">
     <div class="jekyll-linkpreview-content">
@@ -36,10 +49,10 @@
 
 See https://jekyllrb.com/docs/plugins/installation/ .
 
 ## Usage
 
-1. Create `_cache` directory in the same hierarchy as `_site` directory.
+1. Create `_cache` directory where you run `jekyll build` or `jekyll serve`.
 
 1. Embed [linkpreview.css](assets/css/linkpreview.css) into your Website.
 
 1. Use `{% linkpreview %}` tag.