diff --git a/transform.py b/transform.py
index bc3fd5e..696ff44 100644
--- a/transform.py
+++ b/transform.py
@@ -14,7 +14,7 @@ def minimum(data):
 
 def bounds(data):
     "Returns a list of the smallest and largest numbers in data"
-    return min(data), max(data)
+    return [min(data), max(data)]
 
 def clamp(value, low, high):
     """Clamps a value to a range from low to high.