diff --git a/lib/xmet/city.py b/lib/xmet/city.py
index 41df9e8..16765df 100644
--- a/lib/xmet/city.py
+++ b/lib/xmet/city.py
@@ -64,13 +64,13 @@ class City(DatabaseTable):
                 yield City.from_tsv_row(row)
 
     @staticmethod
-    def each_within_poly(db: Database, poly: shapely.Polygon):
+    def each_within_poly(db: Database, poly: shapely.Polygon, limit=None):
         st = db.query(City, [
             'ST_Within(location, GeomFromText(:poly, 4326)) = 1'
         ], {
             'poly': shapely.to_wkt(poly)
         }, [
             ('population', DatabaseOrder.DESC)
-        ])
+        ], limit)
 
         yield from st.each()