diff --git a/sys/lib/plumb/basic b/sys/lib/plumb/basic
index d61b3064f..72e0dc822 100644
--- a/sys/lib/plumb/basic
+++ b/sys/lib/plumb/basic
@@ -103,7 +103,7 @@ plumb	start	window -noscroll -r 4 120 750 600 upas/nedmail -s $0
 
 # man index entries are synthesized
 type is text
-data matches '([a-zA-Z¡-￿0-9_\-./]+)\(([1-8])\)'
+data matches '([a-zA-Z¡-￿0-9_\-./]+)\(([1-9])\)'
 plumb start rc -c 'man -b '$2' '$1'
 
 # RFC references are looked up in /lib/rfc and passed to editor