Merge pull request #21575 from y-yagi/description_of_passing_block_to_add_source

add description of passing a block to `add_source` [ci skip]

1 files changed, 9 insertions, 1 deletions

diff --git a/guides/source/rails_application_templates.md b/guides/source/rails_application_templates.md
index b7364536c3..edd54826cf 100644
--- a/guides/source/rails_application_templates.md
+++ b/guides/source/rails_application_templates.md
@@ -78,7 +78,7 @@ gem_group :development, :test do
 end
 ```
 
-### add_source(source, options = {})
+### add_source(source, options={}, &block)
 
 Adds the given source to the generated application's `Gemfile`.
 
@@ -88,6 +88,14 @@ For example, if you need to source a gem from `"http://code.whytheluckystiff.net
 add_source "http://code.whytheluckystiff.net"
 ```
 
+If block is given, gem entries in block are wrapped into the source group.
+
+```ruby
+add_source "http://gems.github.com/" do
+  gem "rspec-rails"
+end
+```
+
 ### environment/application(data=nil, options={}, &block)
 
 Adds a line inside the `Application` class for `config/application.rb`.