A limerick about limericks

I've been writing verses recently, trying my hand at metre and rhyme. Apparently there are rather strict rules for the rhyming elements of limericks, and I'm still not sure I've got them right. Here's another attempt.

Limericks bring such delight
But they're really not easy to write.
I have a hard time
With the rules about rhyme,
And try as I might, mine are sh*te.