diff --git a/actionmailer/lib/action_mailer/base.rb b/actionmailer/lib/action_mailer/base.rb
index 3b4e59d703..085afb57c1 100644
--- a/actionmailer/lib/action_mailer/base.rb
+++ b/actionmailer/lib/action_mailer/base.rb
@@ -57,7 +57,7 @@ module ActionMailer #:nodoc:
# will accept (any valid Email header including optional fields).
#
# The mail method, if not passed a block, will inspect your views and send all the views with
- # the same name as the method, so the above action would send the +welcome.text.plain.erb+ view
+ # the same name as the method, so the above action would send the +welcome.text.erb+ view
# file as well as the +welcome.text.html.erb+ view file in a +multipart/alternative+ email.
#
# If you want to explicitly render only certain templates, pass a block:
@@ -88,7 +88,7 @@ module ActionMailer #:nodoc:
#
# To define a template to be used with a mailing, create an .erb file with the same
# name as the method in your mailer model. For example, in the mailer defined above, the template at
- # app/views/notifier/signup_notification.text.plain.erb would be used to generate the email.
+ # app/views/notifier/welcome.text.erb would be used to generate the email.
#
# Variables defined in the model are accessible as instance variables in the view.
#
@@ -153,7 +153,7 @@ module ActionMailer #:nodoc:
# by the content type. Each such detected template will be added as separate part to the message.
#
# For example, if the following templates exist:
- # * signup_notification.text.plain.erb
+ # * signup_notification.text.erb
# * signup_notification.text.html.erb
# * signup_notification.text.xml.builder
# * signup_notification.text.yaml.erb
@@ -178,7 +178,7 @@ module ActionMailer #:nodoc:
# end
# end
#
- # Which will (if it had both a welcome.text.plain.erb and welcome.text.html.erb
+ # Which will (if it had both a welcome.text.erb and welcome.text.html.erb
# template in the view directory), send a complete multipart/mixed email with two parts,
# the first part being a multipart/alternative with the text and HTML email parts inside,
# and the second being a application/pdf with a Base64 encoded copy of the file.pdf book