Many small edits.
diff --git a/man/man4/plumber.4 b/man/man4/plumber.4
index 95259a0..0dfe68b 100644
--- a/man/man4/plumber.4
+++ b/man/man4/plumber.4
@@ -16,7 +16,7 @@
Its behavior is programmed by a
.I plumbing
file (default
-.BR /usr/$user/lib/plumbing )
+.BR $HOME/lib/plumbing )
in the format of
.IR plumb (7).
.PP
@@ -96,9 +96,9 @@
include a port that was defined in earlier rules, that port will still exist (although
no new messages will be delivered there).
.SH FILES
-.TF /usr/$user/lib/plumbing
+.TF $HOME/lib/plumbing
.TP
-.B /usr/$user/lib/plumbing
+.B $HOME/lib/plumbing
default rules file
.TP
.B \*9/plumb
