1 files changed, 11 insertions, 3 deletions
diff --git a/actionpack/lib/abstract_controller/rendering.rb b/actionpack/lib/abstract_controller/rendering.rb
index 4b984d0558..f8e4cb4384 100644
--- a/actionpack/lib/abstract_controller/rendering.rb
+++ b/actionpack/lib/abstract_controller/rendering.rb
@@ -97,15 +97,23 @@ module AbstractController
       self.response_body = render_to_body(options)
     end
 
-    # Raw rendering of a template to a string. Just convert the results of
-    # render_response into a String.
+    # Raw rendering of a template to a string.
+    #
+    # It is similar to render, except that it does not
+    # set the response_body and it should be guaranteed
+    # to always return a string.
+    #
+    # If a component extends the semantics of response_body
+    # (as Action Controller extends it to be anything that
+    # responds to the method each), this method needs to
+    # overriden in order to still return a string.
     # :api: plugin
     def render_to_string(*args, &block)
       options = _normalize_render(*args, &block)
       render_to_body(options)
     end
 
-    # Raw rendering of a template to a Rack-compatible body.
+    # Raw rendering of a template.
     # :api: plugin
     def render_to_body(options = {})
       _process_options(options)