-So some other engine should be found and used instead. Enrico had one that
-he was using for debtags stuff that looked pretty good.
+So some other engine should be found and used instead.
+
+Enrico had one that he was using for debtags stuff that looked pretty good.
+That was [Xapian](http://www.xapian.org/), which has perl bindings in
+libsearch-xapian-perl. The nice thing about xapian is that it does a ranked
+search so it understands what words are most important in a search. (So
+does Lucene..) Another nice thing is it supports "more documents like this
+one" kind of search. --[[Joey]]