diff --git a/STM32/bitacora.md b/STM32/bitacora.md
index d30c0b0..53d162c 100644
--- a/STM32/bitacora.md
+++ b/STM32/bitacora.md
@@ -8,4 +8,7 @@ Se instala la herramienta STM32CubeMX la cual ayudara con las configuraciones de
 
 - [x] Blink
 - [x] USB Virtual port
-- [ ] ADC
\ No newline at end of file
+- [ ] ADC
+
+### Referencias
+[https://opensimhardware.wordpress.com/pedal-button-controller/](https://opensimhardware.wordpress.com/pedal-button-controller/)
\ No newline at end of file