diff --git a/othersoft/calibration_console/Source_Files/calibration.cpp b/othersoft/calibration_console/Source_Files/calibration.cpp
index b6704dc..fe4a7b4 100644
--- a/othersoft/calibration_console/Source_Files/calibration.cpp
+++ b/othersoft/calibration_console/Source_Files/calibration.cpp
@@ -233,6 +233,11 @@ void CalibrationAlgorithm::produceCalfile(QString calFilePath, DeviceAttribute d
 	std::ofstream outfile(calFile_csv.toStdString().c_str());
 	for (int i = 0; i < deviceAttribute.iPixels; i++)
 	{
+        if (i==0)
+        {
+            outfile << integratingSphereData.usExposureTimeInMS << std::endl;
+        }
+
 		outfile << deviceAttribute.fWaveLengthInNM[i] << "," << m_gain[i] << std::endl;
 	}
 	outfile.close();