--- a/thermferm/thermferm.h	Thu Feb 07 14:59:47 2019 +0100
+++ b/thermferm/thermferm.h	Wed Feb 27 17:38:06 2019 +0100
@@ -224,6 +224,8 @@
     int			alarm_flag;		/* Alarm flag			*/
     int			alarm_last;		/* Last alarm state		*/
     int			stage;			/* Fermentation stage		*/
+    float		yeast_lo;		/* Yeast low temperature limit	*/
+    float		yeast_hi;		/* Yeast high temperature limit	*/
 } units_list;
 
 #define	UNITMODE_OFF		0		/* Unit turned off		*/