From version 9.58 of the Calendar, support is added for placing comments in the PHSM-Dates.dat and PHSM-Dates.txt files. In PHSM-Dates.dat: Any line in the PHSM-Dates.dat file that does NOT begin with a numeral followed by a comma followed by another numeral and a comma and then some text like: -10,1,text will be considered being a comment. It is recommended to start the commented line with for example ; or // to make it more visible as being a comment. An event can be commented out for future re-use by placing on or more non- alphanumeric characters, like for example ; or // or & or # etc. in front of the event - like: ; 1,1,New Years Day,,lime,,0 In PHSM-Dates.txt: When saving an event from the "Change / Delete / Add Events" dialog all comments in the PHSM-Dates.dat file will be transferred to PHSM-Dates.txt with // in front of the comment (or the old event). Using // is the only way to make comments in PHSM-Dates.txt. Note: Comments that are only present in the PHSM-Dates.txt file will not be transferred to the PHSM-Dates.dat file, and will be lost when saving events via the "Change / Delete / Add Events" dialog. Recommended use: Open the PHSM-Dates.dat file in a text editor (Shift+Alt+click on any date). The lines can now re-arranged and comments can be added to your needs. Save the file and Ctrl+Alt+click on any date to reload the new PHSM-Dates.dat file. Then double-click on any date with an event to open the "Change / Delete / Add Events" dialog. Now click the "Apply" button - this will transfer all the changes in the PHSM-Dates.dat file to the PHSM-Dates.txt file with the correct syntax.