-On Windows, this function doesn't support the @code{'} flag and the @code{hh},
-@code{ll}, @code{j}, @code{t}, @code{z} size specifiers.
+On Windows systems (excluding Cygwin), this function doesn't support
+the @code{'} flag and the @code{hh}, @code{ll}, @code{j}, @code{t},
+@code{z} size specifiers.