diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 14312283d1..ed82c6ba7e 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -283,8 +283,8 @@ module ActiveModel
 
       if options[:default]
         ActiveSupport::Deprecation.warn \
-          "ActiveModel::Errors#generate_message(attributes, custom_message) has been deprecated.\n" +
-          "Use ActiveModel::Errors#generate_message(attributes, :message => 'your message') instead."
+          "Giving :default as validation option to errors.add has been deprecated.\n" +
+          "Please use :message instead."
         options[:message] = options.delete(:default)
       end