README.textile in expedia-0.0.6 vs README.textile in expedia-0.0.7

@@ -35,9 +35,10 @@
 Expedia.api_key = 'your_api_key'
 Expedia.shared_secret = 'your_shared_secret'
 Expedia.locale = 'en_US'
 Expedia.currency_code = 'USD'
 Expedia.minor_rev = 13
+Expedia.use_signature = true # must be false if using ip whitelisting instead of signature
 # Optional configuration...
 Expedia.timeout = 1 # read timeout in sec
 Expedia.open_timeout = 1 # connection timeout in sec
 </pre>