diff --git a/fw/Core/Src/main.c b/fw/Core/Src/main.c
index 8a1e1d7..8de17a9 100644
--- a/fw/Core/Src/main.c
+++ b/fw/Core/Src/main.c
@@ -58,11 +58,13 @@ uint16_t sps30_measured_data[10];
  * this would make modbus register readout easier */
 union {
 	struct {
-		uint16_t CO2;
-		uint16_t T_SCD4x;
-		uint16_t RH_SCD4x;
+		uint16_t CO2;		// input register 30010
+		uint16_t T_SCD4x;	// input register 30011
+		uint16_t RH_SCD4x;	// input register 30012
+		uint16_t T_SHT4x;	// input register 30013
+		uint16_t RH_SHT4x;	// input register 30014
 	};
-	uint16_t array[3];
+	uint16_t array[5];
 } measured_values;
 /* USER CODE END PV */