update readme

msimonborg · Aug 3, 2017 · d16cead · d16cead
1 parent 2655f8e
commit d16cead
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diff --git a/README.md b/README.md
@@ -74,6 +74,12 @@ params.forbid('one' => 'one').to_h # => { "two" => "two" }
 
 If your custom `Hash`-like class implements `#delete` and the `#[]` finder, you can `include Allowable` to mix in the methods.
 
+```ruby
+class MyHash
+  include Allowable
+end
+```
+
 ## Platform support
 
 This gem should work with Ruby >= 2.0.0, however at the moment it is only tested for Ruby >= 2.2.2