update readme

README.md

@@ -1,9 +1,9 @@
 Trigram Search
 ===============
 
-A quick Ruby class to demo Trigram substring inverted index search on a set of strings provided in a CSV.
+A Ruby class to generate a trigram substring inverted index for a set of strings provided in a CSV.
 
-It's a proof of concept, but the index generated could be used for high speed text matching, such as in autocompletes, or in search services. You could, for example, dump the indexes to JSON and use them client side.
+The index generated could be used for high speed text matching, such as in autocompletes, or in search services. You could, for example, dump the indexes to JSON and use them client side.
 
 * http://en.wikipedia.org/wiki/Inverted_index
 * http://en.wikipedia.org/wiki/Substring_index
@@ -13,7 +13,7 @@ examples
 ---------
 
 	cd examples
-  	ruby spanish_municipalities.rb
+	ruby spanish_municipalities.rb
 
 There is a Javascript example which uses the generated search index here: http://tokumine.github.com/trigram_search/
 
@@ -27,5 +27,3 @@ benchmark (n=1000)
 	  0.950000   0.010000   0.960000 (  0.959077)
 
 >1ms per search
-
-Note - this code is pretty unoptimised