diff --git a/eo/src/utils/eoParser.cpp b/eo/src/utils/eoParser.cpp
index 0191d53f..451da162 100644
--- a/eo/src/utils/eoParser.cpp
+++ b/eo/src/utils/eoParser.cpp
@@ -213,7 +213,7 @@ void eoParser::printOn(ostream& os) const
     printSectionHeader(os, section);
     //print every param with its value
     for (; p != params.end(); ++p) 
-    {
+      {
         std::string newSection = p->first;
 
         if (newSection != section)
@@ -224,6 +224,9 @@ void eoParser::printOn(ostream& os) const
     
         eoParam* param = p->second;
 
+	if (!isItThere(*param))  // comment out the ones not set by the user
+	  os << "# ";
+
         string str = "--" + param->longName() + "=" + param->getValue();
         
         os.setf(ios_base::left, ios_base::adjustfield);