README.md in jb-0.6.0 vs README.md in jb-0.6.1

@@ -174,16 +174,15 @@
 
 It's also possible to render collections of partials:
 
 ```ruby
 render partial: 'posts/post', collection: @posts, as: :post
-
-# or
-
-render @post.comments
 ```
 
+> NOTE: Don't use `render @post.comments` because if the collection is empty,
+`render` will return `nil` instead of an empty array.
+
 You can pass any objects into partial templates with or without `:locals` option.
 
 ```ruby
 render 'sub_template', locals: {user: user}
 
@@ -192,10 +191,10 @@
 render 'sub_template', user: user
 ```
 
 You can of course include Ruby `nil` as a Hash value if you want. That would become `null` in the JSON.
 
-To prevent Jb from including null values in the output, Active Support provides `Hash#compact!` method for you:
+You can use `Hash#compact`/`!` method to prevent including `null` values in the output:
 
 ```ruby
 {foo: nil, bar: 'bar'}.compact
 
 # => {"bar": "bar"}