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document COFF alignment limit #2081

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document COFF alignment limit #2081

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5 changes: 3 additions & 2 deletions src/type-layout.md
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Expand Up @@ -573,8 +573,9 @@ guarantees.
r[layout.repr.alignment.constraint-alignment]
The alignment is specified as an integer parameter in the form of
`#[repr(align(x))]` or `#[repr(packed(x))]`. The alignment value must be a
power of two from 1 up to 2<sup>29</sup>. For `packed`, if no value is given,
as in `#[repr(packed)]`, then the value is 1.
power of two from 1 up to 2<sup>29</sup> or a target-specific limit. For COFF
targets the limit is 8192. For `packed`, if no value is given, as in
`#[repr(packed)]`, then the value is 1.

r[layout.repr.alignment.align]
For `align`, if the specified alignment is less than the alignment of the type
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