Specify starting point of foreach enumerator in ruby -

i have rake file pulls in data external csv file , enumerates through with:

csv.foreach(file, :headers => true) |row| 

what effective way (in ruby) specify starting point within spreadsheet?

:headers => true allows me start importing second line, if want start line 20?

use .drop(#rows ignore):

csv.open(file, :headers => true).drop(20).each |row|