Dear NG, The semi-colon needs to be in front of the line to be a comment. What you can do is to use the following: 1- select the lines of code that you want to comment 2- now, after selecting all the lines you want to add the semi-colon, press: Ctrl-; I hope that helps. Cheers, fernando

Thank you Fernando, I was mainly looking for something like we use in C++ or MATLAB, using a single line of opener/closer for the range we want to comment out. Putting ; in front of every line makes this looking confusing while I develop the code and constantly change things around. After a while the information comments and the commented-out codes start to get into each other.. Best regards, - NG