diff --git a/Optional-features.md b/Optional-features.md
index 4ed216c..8191db9 100644
--- a/Optional-features.md
+++ b/Optional-features.md
@@ -10,4 +10,15 @@ When using this option, I recommend using the optional rotary encoder as well to
 # Rotary encoder
 
 The current firmware has an option to use a rotary encoder on pins 2 and 3.
-Connect the middle pin of the rotary encoder to GND, pin A of the rotary encoder to D2, and pin B to D3.
\ No newline at end of file
+Connect the middle pin of the rotary encoder to GND, pin A of the rotary encoder to D2, and pin B to D3.
+
+# MIDI channel select
+If you have a rotary encoder and OLED installed, you can easily change the MIDI channel for the board. 
+By rotating the encoder, you can change the channel from 0-16, or make the board listen on ALL channels.
+After setting the MIDI channel, and a save delay of 2 seconds by default (this can be changed by modifying the `saveDelay` variable in the firmware), the channel will be saved to the Arduino's internal EEPROM. 
+
+This will be indicated by the ![ROM](https://github.com/sgilissen/purrChestrion/blob/main/purrChestrion-arduino/gfx_src/savetorom.bmp?raw=true) indicator in the top-right of the OLED.
+
+The indicator will disappear after 3 seconds.
+
+