ex/riogunzip in rio-0.3.3 vs ex/riogunzip in rio-0.3.4

@@ -22,10 +22,10 @@
 
 # could be written this way
 # rio(?-) < rio(?-).gzip
 #
 # this is similar, but reads the entire file in before writing it out
-#    rio('-').print!( rio('-').gzip.contents )
+#    rio(?-).print!( rio(?-).gzip.contents )
 #
 #rio(?-).gzip.each_record do |rec|
 #  rio(?-).print(rec)
 #end