README.md in dry-data-0.3.0 vs README.md in dry-data-0.3.1

@@ -177,9 +177,15 @@
 and all of its predicates are supported.
 
 IMPORTANT: `dry-data` does not have a runtime dependency on `dry-validation` so
 if you want to use contrained types you need to add it to your Gemfile
 
+If you want to use constrained type you need to require it explicitly:
+
+``` ruby
+require "dry/data/type/constrained"
+```
+
 ``` ruby
 string = Dry::Data["strict.string"].constrained(min_size: 3)
 
 string['foo']
 # => "foo"