diff --git a/sort.py b/sort.py
index 32b08c0..52b55da 100644
--- a/sort.py
+++ b/sort.py
@@ -185,7 +185,7 @@ class Sort(object):
   def update(self,dets):
     """
     Params:
-      dets - a numpy array of detections in the format [[x,y,w,h,score],[x,y,w,h,score],...]
+      dets - a numpy array of detections in the format [[x1,y1,x2,y2,score],[x1,y1,x2,y2,score],...]
     Requires: this method must be called once for each frame even with empty detections.
     Returns the a similar array, where the last column is the object ID.