From c67ceab56a091bda1495f53b91c103ba9577f0ca Mon Sep 17 00:00:00 2001
From: miguel5612 <miguelangelcu@ufps.edu.co>
Date: Thu, 26 Mar 2020 20:13:58 -0500
Subject: [PATCH] Updated add comment

---
 src/MQUnifiedsensor.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/MQUnifiedsensor.cpp b/src/MQUnifiedsensor.cpp
index fef9484..17d0920 100644
--- a/src/MQUnifiedsensor.cpp
+++ b/src/MQUnifiedsensor.cpp
@@ -88,6 +88,7 @@ void MQUnifiedsensor::update()
 }
 float MQUnifiedsensor::calculatePPM(double ratio)
 {
+  //Usage of this function: Unit test on ALgorithmTester example;
   if(_regressionMethod == "Exponential") _PPM= _a*pow(ratio, _b);
   if(_regressionMethod == "Linear") _PPM= _a*ratio + _b;
   return _PPM;