-This module matches the EUI64 part of a stateless autoconfigured IPv6 address. It compares the source MAC address with the lower 64 bits of the IPv6 address.
+This module matches the EUI-64 part of a stateless autoconfigured IPv6 address.
+It compares the EUI-64 derived from the source MAC address in Ehternet frame
+with the lower 64 bits of the IPv6 source address. But "Universal/Local"
+bit is not compared. This module doesn't match other link layer frame, and
+is only valid in the
+.BR PREROUTING ,
+.BR INPUT
+and
+.BR FORWARD
+chains.