diff --git a/README.txt b/README.txt
index 26a334d..bd92332 100644
--- a/README.txt
+++ b/README.txt
@@ -1,5 +1,9 @@
 # STM32-SID-PLAYER
-SID chip (6581 and 8580) and 6502 CPU emulator, with audio output on pin PA8, for STM32 line of microcontrollers, compiled with Arduino IDE, uploaded with ST-LINK V2.
+SID chip and 6502 CPU emulator, with audio output on pin PA8 (PWM) or PA4 (DAC), for STM32 line of microcontrollers, compiled with Arduino IDE
+  My personal breadboard project that i'm still having fun with . 
+      - Mainly done for STM32F103C8 Blue Pill (PWM) and STM32G431CBU6 (WeAct board) (DAC)
+      - Should work with other STM32 microcontrollers that Arduino IDE support.
+      - Tested also at STM32F401CCU6, STM32F411CEU6 and STM32F407VET6 (PWM/DAC) dev boards (and as i see, they all have same pin (PA8) for Timer1,channel1) and same pins for SPI.
 
 Demonstration video: 
  - internal flash memory player  https://www.youtube.com/watch?v=pvWagY7ppYg
@@ -30,4 +34,8 @@ PS2: Also thanks for people who got interested into this project:
         - Matteo         https://www.youtube.com/watch?v=mWr3eCfsWOw               - STM32F103C8 + I2C LCD screen on DIY board
         - Noplan         https://www.youtube.com/channel/UCru3FcoymFzAeXwfSxfGPoQ  - STM32F103C8
         - Xad Nightfall  https://www.youtube.com/watch?v=O6zrsIFlbew               - STM32F407VE dev board + LCD
+
+PS3: Forks worth checking:
+	- Matteo	https://github.com/matt199394/STM32-SID-PLAYER
+	- Christmas SID	https://github.com/texelec/ChristmasSID