diff --git a/include/Thresholds.hpp b/include/Thresholds.hpp
index fe27474..56bb541 100644
--- a/include/Thresholds.hpp
+++ b/include/Thresholds.hpp
@@ -131,6 +131,8 @@
 // This function returns optionally these 3 elements as a tuple.
 std::optional<std::tuple<std::string, std::string, std::string>>
     splitFileName(const std::filesystem::path& filePath);
+std::optional<double> readFile(const std::string& thresholdFile,
+                               const double& scaleFactor);
 
 bool parseThresholdsFromConfig(
     const SensorData& sensorData,