diff --git a/sort.go b/sort.go
index c5018c5..d853e94 100644
--- a/sort.go
+++ b/sort.go
@@ -9,8 +9,8 @@ func (r results) Less(i, j int) bool {
 	return r[i].h[0].count > r[j].h[0].count
 }
 
-func (n histogram) Len() int      { return len(n) }
-func (n histogram) Swap(i, j int) { n[i], n[j] = n[j], n[i] }
-func (n histogram) Less(i, j int) bool {
-	return n[i].count > n[j].count
+func (h histogram) Len() int      { return len(h) }
+func (h histogram) Swap(i, j int) { h[i], h[j] = h[j], h[i] }
+func (h histogram) Less(i, j int) bool {
+	return h[i].count > h[j].count
 }