diff --git a/gcode_process.c b/gcode_process.c
index fe550ba..9160d2e 100644
--- a/gcode_process.c
+++ b/gcode_process.c
@@ -258,7 +258,11 @@ void process_gcode_command() {
 			case 114:
 				sersendf_P("X:%ld,Y:%ld,Z:%ld,E:%ld,F:%ld\n", current_position.X, current_position.Y, current_position.Z, current_position.E, current_position.F);
 				break;
-				
+				// M115- capabilities string
+			case 115:
+				serial_writestr_P("FIRMWARE_NAME:FiveD_on_Arduino FIRMWARE_URL:http%3A//github.com/triffid/FiveD_on_Arduino/ PROTOCOL_VERSION:1.0 MACHINE_TYPE:Mendel EXTRUDER_COUNT:1 HEATER_COUNT:1\n");
+				break;
+
 				#ifdef	HEATER_PIN
 				// M130- heater P factor
 			case 130: