--- a/lucene/src/luan/modules/lucene/Lucene.luan	Wed Aug 10 23:37:23 2016 -0600
+++ b/lucene/src/luan/modules/lucene/Lucene.luan	Fri Aug 12 07:07:14 2016 -0600
@@ -63,6 +63,8 @@
 	end
 
 	function index.search(query, from, to, sort)
+		from or error "missing 'from' parameter"
+		to or error "missing 'to' parameter"
 		local results = {}
 		local function fn(i,doc_fn)
 			if i >= from then