What does this rule mean?

[Richard Smollett <yawningdogge () gmail com>]

This is in my preprocessor.rules file.

alert ( msg: "STREAM5_NO_3WHS"; sid: 20; gid: 129; rev: 1; metadata:
rule-type preproc ; classtype:bad-unknown; )

Where do I find information on what this rule means?

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