diff --git a/CHANGELOG.md b/CHANGELOG.md
index 15da265..1eff515 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,7 +18,7 @@ Whitespace conventions:
 - 1 spaces before normal text
  -->
 
-## [2.0](https://github.com/opal/opal-rails/compare/v1.1.2...v2.0.0) - unreleased
+## [2.0](https://github.com/opal/opal-rails/compare/v1.1.2...v2.0.0) - 2021-02-23
 
 *Bumping a major version, since this version will make a number of dependencies opt-in and drop older Rails and Sprockets versions*
 
diff --git a/README.md b/README.md
index 6e6ca06..04bbeb0 100644
--- a/README.md
+++ b/README.md
@@ -32,27 +32,37 @@ bin/rails opal:install
 
 ### Configuration
 
-Add your configuration in `config/initializers/assets.rb` with the following contents:
+#### For the compiler
+
+Add your configuration for the compiler:
+
+`config/initializers/opal.rb`
 
 ```ruby
 # Compiler options
-Rails.application.config.opal.method_missing           = true
-Rails.application.config.opal.optimized_operators      = true
-Rails.application.config.opal.arity_check              = !Rails.env.production?
-Rails.application.config.opal.const_missing            = true
+Rails.application.config.opal.method_missing_enabled   = true
+Rails.application.config.opal.const_missing_enabled    = true
+Rails.application.config.opal.arity_check_enabled      = true
+Rails.application.config.opal.freezing_stubs_enabled   = true
 Rails.application.config.opal.dynamic_require_severity = :ignore
+```
+
+Check out the full list of the available configuration options at: [lib/opal/config.rb](https://github.com/opal/opal/blob/master/lib/opal/config.rb).
 
-# Other options
+#### For template assigns
 
-# Send local and instance variables down to the view after converting
-# thier value with `.to_json`
+Add your configuration for rendering assigns when using the template handler from actions:
+
+`config/initializers/opal.rb`
+
+```ruby
 Rails.application.config.opal.assigns_in_templates = true
 Rails.application.config.opal.assigns_in_templates = :locals # only locals
 Rails.application.config.opal.assigns_in_templates = :ivars # only instance variables
 ```
 
-For a full list of the available configuration options for the compiler please refer to: [lib/opal/config.rb](https://github.com/opal/opal/blob/master/lib/opal/config.rb).
 
+Local and instance variables will be sent down to the view after converting their values to JSON.
 
 
 ## Usage
diff --git a/bin/sandbox-setup b/bin/sandbox-setup
index 71c1258..7223f0a 100755
--- a/bin/sandbox-setup
+++ b/bin/sandbox-setup
@@ -4,7 +4,7 @@ require 'pathname'
 
 root = Pathname('sandbox')
 
-system 'bin/rails opal:install'
+system 'bin/rails g opal:install'
 system 'bin/rails g controller home index -f'
 
 root.join('config/routes.rb').write <<~RUBY
diff --git a/lib/generators/opal/install/install_generator.rb b/lib/generators/opal/install/install_generator.rb
index ea2ec3f..14cdb6b 100644
--- a/lib/generators/opal/install/install_generator.rb
+++ b/lib/generators/opal/install/install_generator.rb
@@ -4,9 +4,11 @@ class Opal::InstallGenerator < Rails::Generators::Base
   def configure_sprockets
     append_to_file 'app/assets/config/manifest.js', '//= link_directory ../javascript .js'
     template "application.js.rb", "app/assets/javascript/application.js.rb"
+    template "initializer.rb", "config/initializers/opal.rb"
 
     # Add the javascript tag to the application head tag
-    gsub_file 'app/views/layouts/application.html.erb', %r{^( *)</head>},
-      '\1  <%= javascript_include_tag "application", "data-turbolinks-track": "reload" %>\1</head>'
+    gsub_file 'app/views/layouts/application.html.erb', %r{(\n *)</head>},
+      '\1  <%= javascript_include_tag "application", "data-turbolinks-track": "reload" %>' \
+      '\1</head>'
   end
 end
diff --git a/lib/generators/opal/install/templates/initializer.rb b/lib/generators/opal/install/templates/initializer.rb
new file mode 100644
index 0000000..aaba247
--- /dev/null
+++ b/lib/generators/opal/install/templates/initializer.rb
@@ -0,0 +1,22 @@
+# Check out the full list of the available configuration options at
+# https://github.com/opal/opal/blob/master/lib/opal/config.rb
+
+Rails.application.configure do
+  # We suggest keeping the configuration above as default for all environments,
+  # disabling some of them might slightly reduce the bundle size or reduce performance
+  # by degrading some ruby features.
+  config.opal.method_missing_enabled   = true
+  config.opal.const_missing_enabled    = true
+  config.opal.arity_check_enabled      = true
+  config.opal.freezing_stubs_enabled   = true
+  config.opal.dynamic_require_severity = :ignore
+
+  # To enable passing assigns from the controller to the opal template handler
+  # change the following configuration to one of these values:
+  #
+  #   - true    # both locals and instance variables
+  #   - :locals # only locals
+  #   - :ivars  # only instance variables
+  #
+  config.opal.assigns_in_templates = false
+end