diff --git a/README.md b/README.md
index 5412c8c..5c6a762 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ This is a Raspberry Pi Pico MicroPython project that takes an expression pedal i
 
 Midi channel, CC number, and maximum and minimum values are customisable.
 
+The expression pedal is automatically calibrated. At startup, simply move your pedal from minimum to maximum. The values are determined accordingly, and CC messages will start being sent.
+
 Ashley Strahle
 
 https://github.com/ashstrahle
diff --git a/main.py b/main.py
index fb4fb19..78e7ab7 100644
--- a/main.py
+++ b/main.py
@@ -1,3 +1,18 @@
+################################################################################
+#
+# Pi-Pico-ExpressionPedal2Midi
+#
+# Connect an expression pedal to ADC0, and a midi out socket/cable to UART1.
+# Set desired midi channel, change control, and maximum and minimum values
+#
+# Upon run/power on, move expresson pedal from maximum to minimum to calibrate
+# your pedal. CC commands will immediately start sending once calibrated.
+#
+# Ashley Strahle
+# https://github.com/ashstrahle
+#
+################################################################################
+
 import sys
 from machine import ADC, Pin, UART
 import ustruct