diff --git a/smmapdfw/doc/smmapdfw.texi b/smmapdfw/doc/smmapdfw.texi
index b66d797..a25b139 100644
--- a/smmapdfw/doc/smmapdfw.texi
+++ b/smmapdfw/doc/smmapdfw.texi
@@ -162,7 +162,7 @@ so each plugin can define its own data structure.
 @section Sender-address verification plugin
 This plugin performs verifications of sender-addresses.
 
-An m4 file -- @file{verifysender.m4}  providing a sendmail feature is
+An m4 file -- @file{verifysender.m4} -- providing a sendmail feature is
 part of the smmapdfw distribution.
 
 To verify a sender-address, the plugin looks up the primary MX record