diff --git a/sonoff/user_config.h b/sonoff/user_config.h
index 357fe5fab..a07c87ec3 100644
--- a/sonoff/user_config.h
+++ b/sonoff/user_config.h
@@ -342,6 +342,7 @@
 //#define USE_SDM630                               // Add support for Eastron SDM630-Modbus energy meter (+2k code)
   #define SDM630_SPEED         9600              // SDM630-Modbus RS485 serial speed (default: 9600 baud)
 //#define USE_MP3_PLAYER                           // Use of the DFPlayer Mini MP3 Player RB-DFR-562 commands: play, volume and stop
+//  #define MP3_VOLUME           10                // Set the startup volume on init, the range can be 0..30(max)
 
 // Power monitoring sensors -----------------------
 #define USE_PZEM004T                             // Add support for PZEM004T Energy monitor (+2k code)