README.md in mupdf-0.3.0 vs README.md in mupdf-0.4.0

@@ -14,19 +14,33 @@
 
 ## Usage
 
 ### Document
 
-A `MuPDF::Document` wraps for a file:
+A `MuPDF::Document` wraps a PDF file:
 
 ```ruby
 document = MuPDF::Document.new('./file.pdf')
 ```
 
 #### Info
 
-The `info` command displays information about a document such as the number of pages:
+The `info` command displays information about the document such as the number of pages:
 
 ```ruby
 info = document.info
 info.pages # e.g. 2
+```
+
+#### Pages
+
+The `pages` command finds sizing information about the pages within a document:
+
+```ruby
+pages = document.pages
+pages.count # e.g. 2
+page = pages[0]
+page.pagenum # 1
+box = page.media_box # page.crop_box / page.bleed_box / page.trim_box / page.art_box
+box.width # 612
+box.height # 792
 ```