'Why was std::swap moved to <utility>?

Why has std::swap been moved to the <utility> header for C++11?

N3290 C.2.7 says:

17.6.3.2

Effect on original feature: Function swap moved to a different header

Rationale: Remove dependency on <algorithm>for swap.

Effect on original feature: Valid C++ 2003 code that has been compiled expecting swap to be in <algorithm> may have to instead include <utility>.

I can't understand the part in bold. What kind of dependency is being talked about and why?

c++c++11language-lawyerswap


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