--- a/thermferm/thermferm.h	Mon Jan 07 13:23:17 2019 +0100
+++ b/thermferm/thermferm.h	Thu Jan 10 16:33:42 2019 +0100
@@ -211,6 +211,7 @@
 #define	UNITSTAGE_PRIMARY	0		/* Fermentation primary stage	*/
 #define	UNITSTAGE_SECONDARY	1		/* Fermentation secondary stage	*/
 #define	UNITSTAGE_TERTIARY	2		/* Fermentation tertiary stage	*/
+#define	UNITSTAGE_CARBONATION	3		/* Carbonation packaged beer	*/
 
 #define	MQTT_FLAG_DATA		0x0001		/* Show updated data values	*/
 #define	MQTT_FLAG_BIRTH		0x0002		/* Show birth instead of data	*/