As usual, Google is not very clear in their language, so it would be nice if they gave more examples of what is permissible and what is not as far as labels for the section go. When in doubt leave it out. If your sidebar module requires some sort of text heading and you can't leave it blank you could always just put in an asterisk or something - lol. Or, how about, "DON'T click here!" - lol! I wonder how Google would feel about that reverse psychology label? I'm not going to try it to find out - lol.
