README.md in ziptz-1.0.35 vs README.md in ziptz-1.1.35

@@ -26,9 +26,12 @@
 
     z.time_zone_offset('97213') #=> -8
 
 <em>Note that offsets do not include daylight savings time.</em>
 
+Determine if the ZIP code uses Daylight Savings Time:
+
+    z.time_zone_uses_dst?('97213') #=> true
 
 Get all the zip codes in a time zone:
 
     z.zips('American Samoa') #=> ["96799", "96941", "96942", "96943", "96944"]