-.TH PNG 5 "September 8, 2007"
+.TH PNG 5 "April 25, 2013"
.SH NAME
png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION
platforms.
.SH "SEE ALSO"
-.IR libpng(3) ", " zlib(3) ", " deflate(5) ", and " zlib(5)
+.BR "libpng"(3), " libpngpf"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
.LP
PNG specification (second edition), November 2003:
.IP