diff --git a/src/usr/local/www/diag_packet_capture.php b/src/usr/local/www/diag_packet_capture.php
index ac66a55df4..b4b095b8d2 100755
--- a/src/usr/local/www/diag_packet_capture.php
+++ b/src/usr/local/www/diag_packet_capture.php
@@ -315,12 +315,23 @@ $section->addInput(new Form_Checkbox(
'Promiscuous',
'Enable promiscuous mode',
$promiscuous
-))->setHelp('The packet capture will be performed using promiscuous mode.%1$s' .
- 'Note: Some network adapters do not support or work well in promiscuous mode.%1$s' .
- 'More: %2$sPacket capture%3$s',
- '
',
- '',
- '');
+))->setHelp('%1$sNon-promiscuous mode captures only data directly relevant to the host (sent by it, sent or broadcast to it, or routed through it). ' .
+ '%2$s%3$sPromiscuous mode%4$s captures all data seen by the adapter, whether or not related to the host, ' .
+ 'but in some cases may have undesirable side effects. Click Info for details %5$s' .
+ 'Promiscuous mode requires more kernel processing of packets. This puts a slightly higher demand on system resources, especially ' .
+ 'on busy networks or low power processors. The change in packet processing may allow a hostile host to detect that an adapter is in promiscuous mode ' .
+ 'or to \'fingerprint\' the kernel (see %6$s). Some network adapters may not support or work well in promiscuous mode (see %7$s).%8$s',
+
+ '',
+ '
',
+ '',
+ '',
+ '
',
+ ' [1]' .
+ ' [2]',
+ ' [3]',
+ '
'
+);
$section->addInput(new Form_Select(
'fam',