Looking at some other code, I see what you mean about putting \n in the comment line as in

Comment("\nYesterday quotations:\nH ",yesterday_high,"\nL ",yesterday_low, "\nC ",yesterday_close);

but I wanted to print a comment from 2 different lines in the code, like this

if (somecode=othercode){
Comment("Yesterday quotations");}

if (anothercode=yetanother){
Comment("\nTodays quotations");}

With this all I get is the second comment
Todays quotations

not 2 lines