diff --git a/config.json.sample b/config.json.sample
index d8d5731..eb6e836 100644
--- a/config.json.sample
+++ b/config.json.sample
@@ -31,5 +31,6 @@
 	],
 	"target_temperature": 21.0,
 	"hysteresis": 0.5,
+	"boiler_exhaust_t": "/devices/wb-w1/controls/28-000000860adf",
 	"boiler_control": "/devices/wb-gpio/controls/EXT1_R3A8"
   }
\ No newline at end of file