-c option restricts matches to subdirs of cwd.

Closes #83

z.1

@@ -4,7 +4,7 @@ NAME
 z \- jump around
 .SH
 SYNOPSIS
-z [\-h] [\-l] [\-r] [\-t] [regex1 regex2 ... regexn]
+z [\-c] [\-h] [\-l] [\-r] [\-t] [regex1 regex2 ... regexn]
 .SH
 AVAILABILITY
 bash, zsh
@@ -17,6 +17,9 @@ directory that matches ALL of the regexes given on the command line.
 .SH
 OPTIONS
 .TP
+\fB\-c\fR
+restrict matches to subdirectories of the current directory.
+.TP
 \fB\-h\fR
 show a brief help message
 .TP