README.md in google-cloud-recommender-v1-0.4.2 vs README.md in google-cloud-recommender-v1-0.4.3

@@ -16,10 +16,11 @@
 
 In order to use this library, you first need to go through the following steps:
 
 1. [Select or create a Cloud Platform project.](https://console.cloud.google.com/project)
 1. [Enable billing for your project.](https://cloud.google.com/billing/docs/how-to/modify-project#enable_billing_for_a_project)
+1. [Enable the API.](https://console.cloud.google.com/apis/library/recommender.googleapis.com)
 1. {file:AUTHENTICATION.md Set up authentication.}
 
 ## Quick Start
 
 ```ruby
@@ -30,9 +31,12 @@
 response = client.list_recommendations request
 ```
 
 View the [Client Library Documentation](https://googleapis.dev/ruby/google-cloud-recommender-v1/latest)
 for class and method documentation.
+
+See also the [Product Documentation](https://cloud.google.com/recommender)
+for general usage information.
 
 ## Enabling Logging
 
 To enable logging for this library, set the logger for the underlying [gRPC](https://github.com/grpc/grpc/tree/master/src/ruby) library.
 The logger that you set may be a Ruby stdlib [`Logger`](https://ruby-doc.org/stdlib/libdoc/logger/rdoc/Logger.html) as shown below,