use macro for /usr/local/plan9
diff --git a/man/man3/pushtls.3 b/man/man3/pushtls.3
index b92dcb6..5af31d7 100644
--- a/man/man3/pushtls.3
+++ b/man/man3/pushtls.3
@@ -173,7 +173,7 @@
 .SH SOURCE
 .\" .B /sys/src/libc/9sys/pushtls.c
 .\" .br
-.B /usr/local/plan9/src/libsec/port
+.B \*9/src/libsec/port
 .SH "SEE ALSO"
 .IR dial (3),
 .IR thumbprint (7);