--- a/summary.html
+++ b/summary.html
@@ -24,47 +24,50 @@
 implementation by
 <a href="http://www.haible.de/bruno/">Bruno Haible</a>,
 then of Karlsruhe University, and
-<a href="http://www.math.uni-duesseldorf.de/~stoll/">Michael Stoll</a>,
+<a href="http://www.faculty.iu-bremen.de/mstoll/">Michael Stoll</a>,
 then of Munich University, both in Germany.
-It supports the Lisp described in the
+It implements the language described in the
 <a href="http://www.lisp.org/HyperSpec/FrontMatter/">ANSI Common Lisp
-standard</a> plus many extensions.</p>
+standard</a> with many extensions.</p>
 
 <p><a href="http://clisp.cons.org/">CLISP</a> includes an interpreter,
 a <a href="impnotes/bytecode.html">compiler</a>,
 a <a href="impnotes/debugger.html">debugger</a>,
-<a href="http://www.lisp.org/HyperSpec/Body/chap-7.html">CLOS</a>,
+<a href="impnotes/objects.html">CLOS</a>,
 <a href="impnotes/mop-chap.html">MOP</a>,
 a <a href="impnotes/dffi.html">foreign language interface</a>,
 <a href="impnotes/i18n-mod.html">i18n</a>,
-<a href="impnotes/regexp-mod.html">regular expressions</a>,
+<a href="impnotes/regexp-mod.html">POSIX</a> and
+<a href="impnotes/pcre.html">Perl</a> regular expressions,
 a <a href="impnotes/socket.html">socket interface</a>,
-and <a href="impnotes/extensions.html">more</a>.
-An <a href="http://www.the-labs.com/X11/XLib-Manual/">X11</a> interface
+<a href="impnotes/num-concepts.html#bignum-lim">fast bignums</a>,
+<a href="impnotes/num-concepts.html#lfd">arbitrary precision floats</a>,
+and <a href="impnotes/ext-clisp.html">more</a>.
+An <a href="http://www.x.org/docs/X11/xlib.pdf">X11</a> interface
 is available through <a href="http://www.cliki.net/CLX">CLX</a>,
 <a href="http://garnetlisp.sf.net/">Garnet</a> and
 <a href="http://www.cliki.net/CLUE">CLUE</a>/<a href="http://www.cliki.net/CLIO">CLIO</a>.
 Command line editing is provided by
-<a href="http://cnswww.cns.cwru.edu/~chet/readline/rltop.html"
-   >readline</a>.
+<a href="http://tiswww.case.edu/php/chet/readline/rltop.html">readline</a>.
 <a href="http://clisp.cons.org/">CLISP</a> runs
 <a href="http://maxima.sourceforge.net/">Maxima</a>,
 <a href="http://www.cs.utexas.edu/users/moore/acl2/">ACL2</a>
 and <a href="resources.html">many other Common Lisp packages</a>.</p>
 
-<p><a href="http://clisp.cons.org/">CLISP</a> runs on
- most GNU and Unix systems (Linux, FreeBSD, NetBSD, OpenBSD, Solaris,
- Tru64, HP-UX, BeOS, NeXTstep, IRIX, AIX, Mac OS X and others) and on
- other systems (Windows NT/2000/XP/Vista, Windows 95/98/ME)
+<p><a href="http://clisp.cons.org/">CLISP</a> runs on most GNU and Unix
+ systems (GNU/Linux, GNU/Hurd, FreeBSD, NetBSD, OpenBSD, Solaris, Tru64,
+ HP-UX, BeOS, IRIX, AIX, Mac OS X and others)
+ and on other systems (Windows NT/2000/XP/Vista, Windows 95/98/ME)
  and needs only 4 MB of RAM.</p>
 
 <p><a href="http://clisp.cons.org/">CLISP</a> is
 <a href="http://www.gnu.org/philosophy/free-sw.html">Free Software</a>
 and may be distributed under the terms of
 <a href="http://www.gnu.org">GNU</a>
-<a href="http://www.gnu.org/copyleft/gpl.html">GPL</a>.
-You may distribute commercial proprietary applications compiled with
-CLISP, see file
+<a href="http://www.gnu.org/copyleft/gpl.html">GPL</a> version 2 or
+(at your option) any later version.
+You <em>may</em> distribute commercial proprietary applications compiled
+with CLISP, see file
 <a href="http://clisp.cvs.sourceforge.net/*checkout*/clisp/clisp/COPYRIGHT"
    ><code>COPYRIGHT</code></a> in the CLISP distribution.</p>