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Capture Filters are used to filter out uninteresting packets already at capture time. This is done to reduce the size of the resulting capture (file) and is especially useful on high traffic networks or for long term capturing.
-Ethereal uses the pcap (libpcap/WinPcap) filter language for capture filters. This language is explained in the tcpdump man page (http://www.tcpdump.org).
+Wireshark uses the pcap (libpcap/WinPcap) filter language for capture filters. This language is explained in the tcpdump man page under "expression" (http://www.tcpdump.org and search for "selects which").
-Note: This capture filter language is different from the one used for the Ethereal display filters!
+Note: This capture filter language is different from the one used for the Wireshark display filters!
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