diff --git a/Documentation/networking/nf_conntrack-sysctl.txt b/Documentation/networking/nf_conntrack-sysctl.txt
index 399e4e866a9c..433b6724797a 100644
--- a/Documentation/networking/nf_conntrack-sysctl.txt
+++ b/Documentation/networking/nf_conntrack-sysctl.txt
@@ -62,10 +62,13 @@ nf_conntrack_generic_timeout - INTEGER (seconds)
 	protocols.
 
 nf_conntrack_helper - BOOLEAN
-	0 - disabled
-	not 0 - enabled (default)
+	0 - disabled (default)
+	not 0 - enabled
 
 	Enable automatic conntrack helper assignment.
+	If disabled it is required to set up iptables rules to assign
+	helpers to connections.  See the CT target description in the
+	iptables-extensions(8) man page for further information.
 
 nf_conntrack_icmp_timeout - INTEGER (seconds)
 	default 30