I always used "appendix" though "addendum" is alsoused a lot.
HTH

Never "annex"

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Note added at 3 mins (2005-06-13 11:45:29 GMT)
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Let\'s try again:

I always use \"appendix\" though \"addendum\" is also used a lot.

[that\'s better]

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Note added at 5 mins (2005-06-13 11:46:43 GMT)
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appendix («ÈpendIks) n., pl. -dixes or -dices (-dIÇsiùz)
1. a body of separate additional material at the end of a book, magazine, etc., esp. one that is documentary or explanatory.

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Note added at 5 mins (2005-06-13 11:47:05 GMT)
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source = collins en dic


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Note added at 8 mins (2005-06-13 11:50:22 GMT)
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addendum («Èdend«m) n., pl. da (-d«).
1. something added; an addition.
2. a supplement or appendix to a book, magazine, etc.

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Note added at 9 mins (2005-06-13 11:51:23 GMT)
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annex vb. (æÈneks). (tr.)
1. to join or add, esp. to something larger; attach.
2. to add (territory) by conquest or occupation.
3. to add or append as a condition, warranty, etc.
4. to appropriate without permission.