-.TH PNG 5 "June 26, 2010"
+.TH PNG 5 "March 31, 2011"
.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