diff --git a/README.md b/README.md
index 1c01bec..8d98b65 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,12 @@ Just use any of the following validators.
       validates :nif, :valid_spanish_vat => true
     end
 
+You can override the error message using the `message` option.
+
+    class Person < ActiveRecord::Base
+      validates :dni, valid_nif: { message: 'invalid' }
+    end
+
 ## Contributing
 
 1. Fork it
diff --git a/lib/spanish_vat_validators.rb b/lib/spanish_vat_validators.rb
index 0263397..b0a5c52 100644
--- a/lib/spanish_vat_validators.rb
+++ b/lib/spanish_vat_validators.rb
@@ -6,7 +6,7 @@ module ActiveModel::Validations
 
   module SpanishVatValidatorsHelpers
     def message(kind='spanish_vat')
-      I18n.translate!("errors.messages.not_valid_#{kind}") rescue 'is invalid'
+      options[:message] || (I18n.translate!("errors.messages.not_valid_#{kind}") rescue 'is invalid')
     end
 
     # Validates NIF
diff --git a/spec/spanish_vat_validators_spec.rb b/spec/spanish_vat_validators_spec.rb
index 0a6ad48..8e4d6f2 100644
--- a/spec/spanish_vat_validators_spec.rb
+++ b/spec/spanish_vat_validators_spec.rb
@@ -15,6 +15,13 @@
         should_be_invalid(record)
       end
     end
+
+    it 'adds errors with an invalid number and custom message' do
+      %w[Y8527549 S618-5663I 000 Y1527549Z invalid_zip].each do |identification_number|
+        record = build_record(identification_number)
+        should_be_invalid(record, 'invalid')
+      end
+    end
   end
 end
 
@@ -34,6 +41,13 @@
         should_be_invalid(record)
       end
     end
+
+    it 'adds errors with an invalid number and custom message' do
+      %w[1234 96380632 284-59349T 5696134L S6185663I invalid_zip].each do |identification_number|
+        record = build_record(identification_number)
+        should_be_invalid(record, 'invalid')
+      end
+    end
   end
 end
 
@@ -52,6 +66,13 @@
         should_be_invalid(record)
       end
     end
+
+    it 'adds errors with an invalid number and custom message' do
+      %w[1234 96380632 284-59349T 5696134L S6185663I Y8527549Z invalid_zip].each do |identification_number|
+        record = build_record(identification_number)
+        should_be_invalid(record, 'invalid')
+      end
+    end
   end
 end
 
@@ -70,6 +91,13 @@
         should_be_invalid(record)
       end
     end
+
+    it 'adds errors with an invalid number and custom message' do
+      %w[1234 2871341J 284-59349T 22472947S Y8527549Z invalid_zip].each do |identification_number|
+        record = build_record(identification_number)
+        should_be_invalid(record, 'invalid')
+      end
+    end
   end
 end
 
@@ -88,6 +116,13 @@
         should_be_invalid(record)
       end
     end
+
+    it 'adds errors with an invalid number and custom message' do
+      %w[8527549Z 22472947S 000 S6185663I invalid_zip].each do |identification_number|
+        record = build_record(identification_number)
+        should_be_invalid(record, 'invalid')
+      end
+    end
   end
 end
 
@@ -96,10 +131,12 @@ def should_be_valid(record)
   expect(record.errors).to be_empty
 end
 
-def should_be_invalid(record)
-  described_class.new(attributes: :identification_number).validate(record)
+def should_be_invalid(record, message = nil)
+  params = { attributes: :identification_number }
+  params[:message] = message if message
+  described_class.new(params).validate(record)
   expect(record.errors.size).to eq 1
-  expect(record.errors.messages[:identification_number]).to include 'is invalid'
+  expect(record.errors.messages[:identification_number]).to include(message || 'is invalid')
 end
 
 def build_record(identification_number)