Update README with link to local docs

README.md

@@ -6,5 +6,9 @@ A book-publishing system written in Racket. Unstable. Incomplete. Et cetera. I'm
 Install from the command line like so:
 
     raco pkg install pollen
+    
+And update like so:
 
-Scribble docs are installed with the package.
+    raco pkg update pollen
+
+Scribble docs are installed with the package. Or you can [read the docs here](http://mbutterick.github.io/pollen/doc/).