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adding docu to sum! explain target should not alias with the source #49478

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2 changes: 2 additions & 0 deletions base/reducedim.jl
Original file line number Diff line number Diff line change
Expand Up @@ -525,6 +525,8 @@ sum(f, A::AbstractArray; dims)
sum!(r, A)

Sum elements of `A` over the singleton dimensions of `r`, and write results to `r`.
Note that since the sum! function is intended to operate without making any allocations,
the target should not alias with the source.

# Examples
```jldoctest
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