diff --git a/spec/models/father.rb b/spec/models/father.rb
new file mode 100644
index 0000000..00eadf9
--- /dev/null
+++ b/spec/models/father.rb
@@ -0,0 +1,21 @@
+require 'active_record'
+
+class Father < ActiveRecord::Base
+  include AASM
+
+  aasm do
+    state :missing_details, :initial => true
+    state :pending_details_confirmation
+
+    event :add_details do
+      transitions :from => :missing_details, :to => :pending_details_confirmation
+    end
+  end
+
+  def update_state
+     if may_add_details?
+       add_details!
+     end
+  end
+
+end
diff --git a/spec/models/son.rb b/spec/models/son.rb
new file mode 100644
index 0000000..fbaef48
--- /dev/null
+++ b/spec/models/son.rb
@@ -0,0 +1,3 @@
+class Son < Father
+  include AASM
+end
diff --git a/spec/schema.rb b/spec/schema.rb
index 3f1f110..7ddf433 100644
--- a/spec/schema.rb
+++ b/spec/schema.rb
@@ -27,4 +27,9 @@ ActiveRecord::Schema.define(:version => 0) do
     t.string "status"
   end
 
+  create_table "fathers", :force => true do |t|
+    t.string "aasm_state"
+    t.string "type"
+  end
+
 end
diff --git a/spec/unit/subclassing_spec.rb b/spec/unit/subclassing_spec.rb
index b71d9f0..7ceb44d 100644
--- a/spec/unit/subclassing_spec.rb
+++ b/spec/unit/subclassing_spec.rb
@@ -1,6 +1,8 @@
 require 'spec_helper'
 
 describe 'subclassing' do
+  let(:son) {Son.new}
+
   it 'should have the parent states' do
     Foo.aasm_states.each do |state|
       FooTwo.aasm_states.should include(state)
@@ -15,5 +17,15 @@ describe 'subclassing' do
   it "should have the same events as its parent" do
     Baz.aasm_events.should == Bar.aasm_events
   end
+
+  it 'should know how to respond to `may_add_details?`' do
+    son.may_add_details?.should be_true
+  end
+
+  it 'should not break if I call Son#update_state' do
+    son.update_state
+    son.aasm_current_state.should == :pending_details_confirmation
+  end
+  
 end