In the spam filter scripts, blank lines are ignored.
Any line beginning with a # character is treated as a comment. Comments must be on a line of their own; there is no way to add a comment to the end of a line.
The following example demonstrates valid uses of comments
${Apples} = 1
# A comment can go here
#This is another comment, but I'll type code on the next line
${Pears} = 2
The following example shows an invalid use of comments
${Apples} = 1 #Comments should never appear on the same line as any of your code