diff --git a/README.md b/README.md
index 62a4409..109ce74 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,9 @@ Connect the peripherals the following way (peripheral signal; peripheral pin; mi
   - 4x column 1 buttons; ; PA5; ; column 1, with a pull-down resistor
   - 4x column 2 buttons; ; PA6; ; column 2, with a pull-down resistor
   - 4x column 3 buttons; ; PA15; ; column 3, with a pull-down resistor
+- 1x piezo-electric element (buzzer, without driver)
+  - pin 1; ; PA7; TIM1_CH1; PWM with 4 kHz used
+  - pin 2; ; PA8; TIM1_CH1N; PWM with 4 kHz used
 
 All pins are configured using `define`s in the corresponding source code.