It is great that you can use markdown in this field - makes it nice and easy!
However, when setting this up just now, I found that I wanted more text to fully explain things. And I hit the limit (it wasn’t obvious that there was one until I tripped over it).
Also, I needed to add some markdown elements (image with a link), which really blew out the limit.
May I suggest:
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That the character limit is lifted to 1000 characters
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The fact that you can use markdown is made obvious
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That the limit is made explicit before people break it (somehow) - although this is a minor irritation in the scheme of things