update README

README.md

@@ -12,13 +12,13 @@ a PDF::Content graphics object
 This back-end is **experimental**.
 
 This module is an alternative to [HTML::Canvas](https://raku.land/zef:dwarring/HTML::Canvas),
-which is also able to save PDF files.
+which is also able to save complete PDF files via [Cairo](https://raku.land/github:timo/Cairo).
 
 It may be useful, if you wish to manipulate existing PDF files
 using the HTML Canvas API, or are wishing to integrate with
 Raku PDF modules such as PDF::Lite or PDF::API6.
 
-If this module is installed, the PDF::Content `canvas()`
+If this module is installed, the PDF::Content `html-canvas()`
 method will automatically render to a graphics stream using the
 `HTML::Canvas::To::PDF` back-end. The backend can thus be used on
 PDF Pages or XObject Forms: