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What is the correct spelling: wrapable, or wrappable?

My mother "corrected" me and said "shouldn't shippable be spelled as shipable"? My gut feeling said two p's, but I couldn't think of a reason why. So I googled it and it is spelled with two p's, but I still don't know why. As far as I am concerned it could just as well be spelled with one 'p'.

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marked as duplicate by PLL, Kosmonaut Jun 15 '11 at 22:06

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can some help with the tags, thanks! –  albertjan Jun 15 '11 at 21:32
Related: english.stackexchange.com/q/4791/1547 –  Marthaª Jun 15 '11 at 21:42
We write shipping, shipped and shipper, right? So, shippable. –  Kosmonaut Jun 15 '11 at 21:48

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up vote 1 down vote accepted

The rule, from the related questions, is: when adding a tense suffix other than "-s", like "-ing", "-ed", "-able", etc, you should double the ending consonant when the last syllable of the word ends in a single consonant, and that syllable is stressed. So, "ship", being a single syllable, is stressed, and it ends in a single consonant (instead of a double like ch, ss, ng, ck, nt, etc), so double it.

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