zip_set_file_comment —
set comment for file in zip (obsolete interface)
#include <zip.h>
int
  
  zip_set_file_comment(zip_t
    *archive, zip_uint64_t
    index, const char
    *comment, int
  len);
The zip_set_file_comment() function is the obsolete
  version of
  zip_file_set_comment(3).
  The only differences are the type of the len argument
  and the additional flags argument.
  zip_set_file_comment() is the same as calling
  zip_file_set_comment(3)
  with an empty flags argument.
zip_set_file_comment() was added in libzip 0.7. In
  libzip 0.10 the type of index was changed from
  int to zip_uint64_t. It was
  deprecated in libzip 0.11, use zip_file_set_comment()
  instead.