diff --git a/ModelFit/mitkExponentialDecayModelTest_profile.json b/ModelFit/mitkExponentialDecayModelTest_profile.json
index 89997be..b0558aa 100644
--- a/ModelFit/mitkExponentialDecayModelTest_profile.json
+++ b/ModelFit/mitkExponentialDecayModelTest_profile.json
@@ -1,22 +1,22 @@
 {
   "parameterNames": [ "y-intercept", "lambda" ],
   "numberOfParameters": 2,
   "parameterScales": [ 1.0, 1.0 ],
   "parameterUnits": [ "[unit of y]", "[unit of x]" ],
   "derivedParameterNames": [ "rate" ],
   "numberOfDerivedParameters": 1,
   "derivedParameterScales": [ 1.0 ],
   "derivedParameterUnits": [ "1/[unit of x]" ],
   "staticParameterNames": null,
   "numberOfStaticParameters": 0,
   "staticParameterUnits": null,
   "modelDisplayName": "Exponential Decay Model",
   "modelType": "Generic",
-  "functionString": "y(x) = y-intercept * exp(-t/lambda)",
+  "functionString": "y(x) = y-intercept * exp(-x/lambda)",
   "classID": "ExponentialDecayModel",
   "xName": "x",
   "xAxisName": "X",
   "xAxisUnit": "unit of x",
   "yAxisName": "Y",
   "yAxisUnit": "unit of y"
 }