Text Multiline Cannot be used for notification triggers?

I have a proposal review system that is set to notify people when the status changes on the proposal to flag them it is ready for their review.....

However, I want to also send an email if the comments area changes (i.e. someone asks a question).  but, unless I am missing something, I cannot use a text multi-line (with logging) field as a trigger for additional criteria in a notification?

Any ideas how to get around this?  I had it on a blanket when modified setting and it was firing off WAY too many emails quickly.

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Ivan Weiss
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