libxt_recent: Fix missing space in manpage for --mask option

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/extensions/libxt_recent.man b/extensions/libxt_recent.man
index 8e6a8e9..d9bd5d2 100644
--- a/extensions/libxt_recent.man
+++ b/extensions/libxt_recent.man
@@ -24,7 +24,7 @@
 \fB\-\-rdest\fP
 Match/save the destination address of each packet in the recent list table.
 .TP
-\fB\-\-mask\fPnetmask
+\fB\-\-mask\fP \fInetmask\fP
 Netmask that will be applied to this recent list.
 .TP
 [\fB!\fP] \fB\-\-rcheck\fP