diff --git a/lib/SNMP/Info/Layer7/Netscaler.pm b/lib/SNMP/Info/Layer7/Netscaler.pm
index 8c1d9c86..282ebf1b 100644
--- a/lib/SNMP/Info/Layer7/Netscaler.pm
+++ b/lib/SNMP/Info/Layer7/Netscaler.pm
@@ -196,7 +196,7 @@ C<sysHardwareVersionDesc>
 
 =item $ns->serial()
 
-Returns ''.
+C<sysHardwareSerialNumber>
 
 =back