1 files changed, 4 insertions, 2 deletions
diff --git a/Help/guide/tutorial/Step1/tutorial.cxx b/Help/guide/tutorial/Step1/tutorial.cxx
index f8dd0c6..08323bf 100644
--- a/Help/guide/tutorial/Step1/tutorial.cxx
+++ b/Help/guide/tutorial/Step1/tutorial.cxx
@@ -11,9 +11,11 @@ int main(int argc, char* argv[])
     return 1;
   }
 
-  double inputValue = atof(argv[1]);
+  // convert input to double
+  const double inputValue = atof(argv[1]);
 
-  double outputValue = sqrt(inputValue);
+  // calculate square root
+  const double outputValue = sqrt(inputValue);
   std::cout << "The square root of " << inputValue << " is " << outputValue
             << std::endl;
   return 0;