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diff -rup a/manual/stdio.texi b/manual/stdio.texi
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--- a/manual/stdio.texi	2012-01-01 05:16:32.000000000 -0700
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+++ b/manual/stdio.texi	2012-02-09 23:46:31.660912211 -0700
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@@ -2324,6 +2324,8 @@ the @var{size} argument specifies the ma
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 produce.  The trailing null character is counted towards this limit, so
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 you should allocate at least @var{size} characters for the string @var{s}.
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+The trailing null byte is added to @var{s}, unless @var{size} is zero.
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+
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 The return value is the number of characters which would be generated
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 for the given input, excluding the trailing null.  If this value is
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 greater or equal to @var{size}, not all characters from the result have