diff --git a/tech/RP2040.wiki b/tech/RP2040.wiki
index 5b5f36f..0190656 100644
--- a/tech/RP2040.wiki
+++ b/tech/RP2040.wiki
@@ -4,6 +4,17 @@ Raspberry pi's micrcontroler, based on the RP2040
 
 See datasheet https://datasheets.raspberrypi.org/pico/pico-datasheet.pdf
 
+== Pins ==
+
+* VBUS is the 5V from the USB
+* VSYS is the input voltage, from 2V to 5V. There is an on board voltage
+  regulator to bring it down to 3.3V
+* 3V3 is 3.3 volt output with a max draw of 300ma
+* 3V3_EN is an input that allows you to shut off the internal voltage regulator
+* RUN is the reset line
+* Pins GP28 - GP 26 have ADC's attached, with a 12 bit resolution
+
+
 == Interrupts ==
 
 Hardware interrupts uses standard ARM nested vectored interrupt controller.