README.md in actionview-component-1.3.6 vs README.md in actionview-component-1.4.0

@@ -13,11 +13,11 @@
 
 As the goal of this gem is to be upstreamed into Rails, it is designed to integrate as seamlessly as possible, with the [least surprise](https://www.artima.com/intv/ruby4.html).
 
 ## Compatibility
 
-`actionview-component` is tested for compatibility with combinations of Ruby `2.3`/`2.4`/`2.5`/`2.6` and Rails `5.0.0`/`5.2.3`/`6.0.0`/`6.1.0.alpha`.
+`actionview-component` is tested for compatibility with combinations of Ruby `2.4`/`2.5`/`2.6` and Rails `5.0.0`/`5.2.3`/`6.0.0`/`6.1.0.alpha`.
 
 ## Installation
 Add this line to your application's Gemfile:
 
 ```ruby
@@ -176,16 +176,31 @@
   include ActionView::Component::TestHelpers
 
   def test_render_component
     assert_equal(
       %(<span title="my title">Hello, World!</span>),
-      render_inline(TestComponent, title: "my title") { "Hello, World!" }.css("span").to_html
+      render_inline(TestComponent, title: "my title") { "Hello, World!" }.to_html
     )
   end
 end
 ```
 
 In general, we’ve found it makes the most sense to test components based on their rendered HTML.
+
+#### Action Pack Variants
+
+To test a specific variant you can wrap your test with the `with_variant` helper method as:
+
+```ruby
+def test_render_component_for_tablet
+  with_variant :tablet do
+    assert_equal(
+      %(<span title="my title">Hello, tablets!</span>),
+      render_inline(TestComponent, title: "my title") { "Hello, tablets!" }.css("span").to_html
+    )
+  end
+end
+```
 
 ## Frequently Asked Questions
 
 ### Can I use other templating languages besides ERB?