diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 45ef14013a62bff9b9a16d935607e1c02ab02b2e..191039f598b1bc6d888f2246bdd65b9057e58db9 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -372,7 +372,7 @@ def add_on_blank(attributes, options = {})
 
         To achieve the same use:
 
-          errors.add(attribute, :empty, options) if value.blank?
+          errors.add(attribute, :blank, options) if value.blank?
       MESSAGE
 
       Array(attributes).each do |attribute|