Index: head/graphics/pgplot/pkg-descr
===================================================================
--- head/graphics/pgplot/pkg-descr	(revision 552857)
+++ head/graphics/pgplot/pkg-descr	(revision 552858)
@@ -1,12 +1,12 @@
 PGPLOT is a Fortran subroutine package for drawing graphs on a variety
 of display devices. For more details, see the manual ``PGPLOT Graphics
 Subroutine Library'', available from T. J. Pearson.
 
 The CPGPLOT library adds an intermediate level of wrapper functions
 between C programs and the PGPLOT library. These functions hide the
 system dependencies of calling PGPLOT behind a system independent
 interface.
 
 Documentation and demo programs are included.
 
-WWW: http://www.astro.caltech.edu/~tjp/pgplot/
+WWW: https://sites.astro.caltech.edu/~tjp/pgplot/