diff --git a/lang/en_utf8/auth.php b/lang/en_utf8/auth.php
index 36c42a6..c722304 100644
--- a/lang/en_utf8/auth.php
+++ b/lang/en_utf8/auth.php
@@ -260,7 +260,7 @@ $string['auth_ntlmsso_enabled'] = 'Set to yes to attempt Single Sign On with the
 $string['auth_ntlmsso_ie_fastpath'] = 'Set to yes to enable the NTLM SSO fast path (bypasses certain steps and only works if the client\'s browser is MS Internet Explorer).';
 $string['auth_ntlmsso_ie_fastpath_key'] = 'MS IE fast path?';
 $string['auth_ntlmsso_subnet_key'] = 'Subnet';
-$string['auth_ntlmsso_subnet'] = 'If set, it will only attempt SSO with clients in this subnet. Format: xxx.xxx.xxx.xxx/bitmask';
+$string['auth_ntlmsso_subnet'] = 'If set, it will only attempt SSO with clients in this subnet. Format: xxx.xxx.xxx.xxx/bitmask. Separate multiple subnets with \',\' (comma).';
 $string['ntlmsso_attempting'] = 'Attempting Single Sign On via NTLM...';
 $string['ntlmsso_failed'] = 'Auto-login failed, try the normal login page...';
 $string['ntlmsso_isdisabled'] = 'NTLM SSO is disabled.';