diff --git a/sonoff/language/cs-CZ.h b/sonoff/language/cs-CZ.h
index 23c01a1b3..b37e2a2fa 100644
--- a/sonoff/language/cs-CZ.h
+++ b/sonoff/language/cs-CZ.h
@@ -517,6 +517,7 @@
 #define D_SENSOR_TM1638_STB "TM16 STB"
 #define D_SENSOR_HX711_SCK "HX711 SCK"
 #define D_SENSOR_HX711_DAT "HX711 DAT"
+#define D_SENSOR_TX20_TX "TX20"
 
 // Units
 #define D_UNIT_AMPERE "A"