Document search target.

README

@@ -20,6 +20,13 @@ The section "The Ports Collection" will tell you how to use the
 ports and packages and the "Porting Applications" section
 describes how one can contribute to the ports collection.
 
+If you would like to search for a given port, you can do so easily
+by saying:
+
+	make search key="<keyword>"
+
+Which will generate a list of all ports matching <keyword>.
+
 NOTE:  This tree can GROW significantly in size during normal usage!
 The distribution tar files can and do accumulate in /usr/ports/distfiles,
 and the individual ports will also use up lots of space in their work
@@ -29,3 +36,4 @@ cleaned without ill-effect, though if you don't have the original
 distribution tarball(s) for something on CDROM then you will need to pull
 it all over your network connection again if you ever try to build the
 associated port.
+