diff --git a/scribbles_and_notes/pin_interface_CRTP_style/pin_modleing_with_CRTP/main.cpp b/scribbles_and_notes/pin_interface_CRTP_style/pin_modleing_with_CRTP/main.cpp
index 0c05c7f..4bbbd67 100644
--- a/scribbles_and_notes/pin_interface_CRTP_style/pin_modleing_with_CRTP/main.cpp
+++ b/scribbles_and_notes/pin_interface_CRTP_style/pin_modleing_with_CRTP/main.cpp
@@ -14,7 +14,6 @@
 template <typename Derived>
 struct PinBase
 {
-
     void set(bool logic)
     {
         static_cast<Derived*>(this)->setImp(logic);
@@ -59,6 +58,11 @@ struct PinBase
 
 struct STM32_Pin : PinBase<STM32_Pin>
 {
+    STM32_Pin()
+    {
+        std::cout << "created STM32_Pin" << std::endl;
+    }
+
     void setImp(bool logic)
     {
         std::cout << "stm32 pin set to " << logic << std::endl;
@@ -73,10 +77,21 @@ struct STM32_Pin : PinBase<STM32_Pin>
     {
         return true;
     }
+
+
+    void STM32_stuff()
+    {
+        std::cout << "STM_32 specific stuff" << std::endl;
+    }
 };
 
 struct AVR_Pin : PinBase<AVR_Pin>
 {
+    AVR_Pin()
+    {
+        std::cout << "created AVR_Pin" << std::endl;
+    }
+
     void setImp(bool logic)
     {
         std::cout << "AVR pin set to " << logic << std::endl;
@@ -91,6 +106,11 @@ struct AVR_Pin : PinBase<AVR_Pin>
     {
         return true;
     }
+
+    void avr_stuff()
+    {
+        std::cout << "AVR specific stuff" << std::endl;
+    }
 };
 
 template<typename T>
@@ -106,6 +126,11 @@ int main(void)
     STM32_Pin pin1;
     AVR_Pin pin2;
 
+
+    pin1.STM32_stuff();
+
+    pin2.avr_stuff();
+
     foo(pin1);
     foo(pin2);
 
diff --git a/scribbles_and_notes/pin_interface_CRTP_style/pin_modleing_with_CRTP/runtest b/scribbles_and_notes/pin_interface_CRTP_style/pin_modleing_with_CRTP/runtest
index 8f3b9a1..12fab27 100755
Binary files a/scribbles_and_notes/pin_interface_CRTP_style/pin_modleing_with_CRTP/runtest and b/scribbles_and_notes/pin_interface_CRTP_style/pin_modleing_with_CRTP/runtest differ