diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb
index a158e6dbae23e54c097756a933a3c8bf57610579..5ea1b2cc1a18745a9d4c3758a6654b3342b8fa35 100644
--- a/actionpack/lib/action_controller/metal/strong_parameters.rb
+++ b/actionpack/lib/action_controller/metal/strong_parameters.rb
@@ -25,9 +25,9 @@ def initialize(param) # :nodoc:
   #   params.permit(:c)
   #   # => ActionController::UnpermittedParameters: found unpermitted keys: a, b
   class UnpermittedParameters < IndexError
-    attr_reader :params
+    attr_reader :params # :nodoc:
 
-    def initialize(params)
+    def initialize(params) # :nodoc:
       @params = params
       super("found unpermitted keys: #{params.join(", ")}")
     end
@@ -60,12 +60,11 @@ def initialize(params)
   # It provides two options that controls the top-level behavior of new instances:
   #
   # * +permit_all_parameters+ - If it's +true+, all the parameters will be
-  # permitted by default. The default value for +permit_all_parameters+
-  # option is +false+.
-  # * +raise_on_unpermitted_parameters+ - If it's +true+, it will raise an exception
-  # if parameters that are not explicitly permitted are found. The default value for
-  # +raise_on_unpermitted_parameters+ # option is +true+ in test and development
-  # environments, +false+ otherwise.
+  #   permitted by default. The default is +false+.
+  # * +raise_on_unpermitted_parameters+ - If it's +true+, it will raise an
+  #   ActionController::UnpermittedParameters exception if parameters that are not
+  #   explicitly permitted are found. The default value is +true+ in test and
+  #   development environments, +false+ otherwise.
   #
   #   params = ActionController::Parameters.new
   #   params.permitted? # => false