--- a/globalneighbors/distance.py	Sat Jun 24 14:04:00 2017 -0700
+++ b/globalneighbors/distance.py	Sat Jun 24 14:48:31 2017 -0700
@@ -57,19 +57,21 @@
                         k=10,
                         lat_tol=1.,
                         lon_tol=1.,
-                        output=1000,
+                        output=None,
                         neighbors=None):
     """
     calculate `k` nearest neighbors for each location
+
+    locations -- dict of `geoid: (lat, lon)`
     """
     neighbors = neighbors or {}
-    items = locations.items()
+    items = locations.items()  # copy
     index = 0
     n_items = len(items)
     start = int(time.time())
     while items:
         index += 1
-        if not index % output:
+        if output and not index % output:
             # output status counter
             now = int(time.time())
             duration =  now - start