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-rw-r--r--actionpack/lib/action_controller/metal/url_for.rb5
1 files changed, 4 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/metal/url_for.rb b/actionpack/lib/action_controller/metal/url_for.rb
index 572d1770f7..fbaa90d521 100644
--- a/actionpack/lib/action_controller/metal/url_for.rb
+++ b/actionpack/lib/action_controller/metal/url_for.rb
@@ -4,7 +4,10 @@ module ActionController
#
# In addition to <tt>AbstractController::UrlFor</tt>, this module accesses the HTTP layer to define
# url options like the +host+. In order to do so, this module requires the host class
- # to implement +env+ and +request+, which need to be a Rack-compatible.
+ # to implement +env+ which needs to be Rack-compatible and +request+
+ # which is either instance of +ActionDispatch::Request+ or an object
+ # that responds to <tt>host</tt>, <tt>optional_port</tt>, <tt>protocol</tt> and
+ # <tt>symbolized_path_parameter</tt> methods.
#
# class RootUrl
# include ActionController::UrlFor