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-rw-r--r--actionpack/lib/action_dispatch/routing/url_for.rb6
1 files changed, 6 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/routing/url_for.rb b/actionpack/lib/action_dispatch/routing/url_for.rb
index bfdea41f60..6c3fc5126a 100644
--- a/actionpack/lib/action_dispatch/routing/url_for.rb
+++ b/actionpack/lib/action_dispatch/routing/url_for.rb
@@ -115,6 +115,12 @@ module ActionDispatch
# * <tt>:host</tt> - Specifies the host the link should be targeted at.
# If <tt>:only_path</tt> is false, this option must be
# provided either explicitly, or via +default_url_options+.
+ # * <tt>:subdomain</tt> - Specifies the subdomain of the link, using the +tld_length+
+ # to split the domain from the host.
+ # * <tt>:domain</tt> - Specifies the domain of the link, using the +tld_length+
+ # to split the subdomain from the host.
+ # * <tt>:tld_length</tt> - Optionally specify the tld length (only used if :subdomain
+ # or :domain are supplied).
# * <tt>:port</tt> - Optionally specify the port to connect to.
# * <tt>:anchor</tt> - An anchor name to be appended to the path.
# * <tt>:trailing_slash</tt> - If true, adds a trailing slash, as in "/archive/2009/"