Annex C (informative) Compatibility [diff]

C.3 C++ and ISO C++ 2011 [diff.cpp11]

C.3.6 Clause [library]: library introduction [diff.cpp11.library]

[headers]
Change: New header.
Rationale: New functionality.
Effect on original feature: The C++ header <shared_mutex> is new. Valid C++ 2011 code that #includes a header with that name may be invalid in this International Standard.