diff --git a/AUTHORS.txt b/AUTHORS.txt
index 4cd0334..47d330b 100644
--- a/AUTHORS.txt
+++ b/AUTHORS.txt
@@ -4,6 +4,7 @@ Written by Michal Migurski.
 With contributions from:
 
 Aubrey Holland
+Matt Kenny
 Tom MacWright
-oltonn
 Dane Springmeyer
+Oliver Tonnhofer
diff --git a/cascadenik/style.py b/cascadenik/style.py
index ce9e605..0e9c7c9 100644
--- a/cascadenik/style.py
+++ b/cascadenik/style.py
@@ -397,8 +397,12 @@ def convertZoomTests(self, is_merc=True):
             15: (12500, 25000),
             16: (5000, 12500),
             17: (2500, 5000),
-            18: (1000, 2500)
-            }
+            18: (1000, 2500),
+            19: (500, 1000),
+            20: (250, 500),
+            21: (100, 250),
+            22: (50, 100),
+           }
         
         for test in self.elements[0].tests:
             if test.property == 'zoom':