README.md in json_builder-3.0.3 vs README.md in json_builder-3.0.4

@@ -109,11 +109,11 @@
 num_pages @users.num_pages
 results @users do |user|
   id user.id
   name user.name
   body user.body
-  url user_url(url)
+  url user_url(user)
   links user.links do |link|
     url link.url
     visits link.visits
     last_visited link.last_visited
   end
@@ -236,9 +236,20 @@
 JSON Builder is very fast, it's roughly 3.6 times faster than the core XML Builder based on the [speed benchmark](http://github.com/dewski/json_builder/blob/master/spec/benchmarks/builder.rb).
 
                  user       system      total       real
     JSONBuilder  2.950000   0.010000    2.960000    (2.968790)
         Builder  10.820000  0.040000    10.860000   (10.930497)
+
+## Other JSON Builders
+
+There are quite a few other alternatives to JSON Builder, each good in their own way with different DSL's and design approaches that are worth checking out:
+
+ * [jbuilder](https://github.com/rails/jbuilder)
+ * [RABL](https://github.com/nesquena/rabl)
+ * [Tequila](https://github.com/inem/tequila)
+ * [Argonaut](https://github.com/jbr/argonaut)
+ * [Jsonify](https://github.com/bsiggelkow/jsonify)
+ * [RepresentationView](https://github.com/mdub/representative_view)
 
 ## Note on Patches/Pull Requests
 
 - Fork the project.
 - Make your feature addition or bug fix.
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