Readded some documentation about substitution values.

1 files changed, 3 insertions, 3 deletions

diff --git a/guides/source/testing.md b/guides/source/testing.md
index 5f07f0cc93..5825ee1074 100644
--- a/guides/source/testing.md
+++ b/guides/source/testing.md
@@ -597,13 +597,13 @@ end
 
 Testing the response to your request by asserting the presence of key HTML elements and their content is a useful way to test the views of your application. The `assert_select` assertion allows you to do this by using a simple yet powerful syntax.
 
-NOTE: You may find references to `assert_tag` in other documentation. This has been removed in 4.1. Use `assert_select` instead.
+NOTE: You may find references to `assert_tag` in other documentation. This has been removed in 4.2. Use `assert_select` instead.
 
 There are two forms of `assert_select`:
 
 `assert_select(selector, [equality], [message])` ensures that the equality condition is met on the selected elements through the selector. The selector may be a CSS selector expression (String) or an expression with substitution values.
 
-`assert_select(element, selector, [equality], [message])` ensures that the equality condition is met on all the selected elements through the selector starting from the _element_ (instance of `Nokogiri::XML::Node`) and its descendants.
+`assert_select(element, selector, [equality], [message])` ensures that the equality condition is met on all the selected elements through the selector starting from the _element_ (instance of `Nokogiri::XML::Node` or `Nokogiri::XML::NodeSet`) and its descendants.
 
 For example, you could verify the contents on the title element in your response with:
 
@@ -633,7 +633,7 @@ assert_select "ol" do
 end
 ```
 
-The `assert_select` assertion is quite powerful. For more advanced usage, refer to its [documentation](http://api.rubyonrails.org/classes/ActionDispatch/Assertions/SelectorAssertions.html).
+The `assert_select` assertion is quite powerful. For more advanced usage, refer to its [documentation](https://github.com/rails/rails-dom-testing/blob/master/lib/rails/dom/testing/assertions/selector_assertions.rb).
 
 #### Additional View-Based Assertions