From 36a7f4d527ccbaf44a9aca0c37d10c1aeb4399b3 Mon Sep 17 00:00:00 2001
From: Neville Li <neville@spotify.com>
Date: Mon, 8 Jan 2018 12:32:58 -0500
Subject: [PATCH] update NGrams preconditions

---
 .../main/scala/com/spotify/featran/transformers/NGrams.scala    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/main/scala/com/spotify/featran/transformers/NGrams.scala b/core/src/main/scala/com/spotify/featran/transformers/NGrams.scala
index 0a520c5a..f4a5b37b 100644
--- a/core/src/main/scala/com/spotify/featran/transformers/NGrams.scala
+++ b/core/src/main/scala/com/spotify/featran/transformers/NGrams.scala
@@ -45,7 +45,7 @@ object NGrams {
   def apply(name: String, low: Int = 1, high: Int = -1, sep: String = " ")
   : Transformer[Seq[String], Set[String], SortedMap[String, Int]] = {
     require(low > 0, "low must be > 0")
-    require(high > 0 || high == -1, "high must > 0 or -1")
+    require(high >= low || high == -1, "high must >= low or -1")
     new NGrams(name, low, high, sep)
   }
 }