use macro for /usr/local/plan9
diff --git a/man/man1/web.1 b/man/man1/web.1
index 0bcc9ca..cf0b691 100644
--- a/man/man1/web.1
+++ b/man/man1/web.1
@@ -64,12 +64,12 @@
 rules for opening web pages and writing mail messages.
 .SH FILES
 .TP
-.B /usr/local/plan9/plumb/basic
+.B \*9/plumb/basic
 plumbing rules using
 .I web
 and
 .I wmail
 .SH SOURCE
-.B /usr/local/plan9/bin
+.B \*9/bin
 .SH SEE ALSO
 .IR plumber (4)