README.md in securetrading-0.2.0 vs README.md in securetrading-0.3.0

@@ -73,20 +73,20 @@
     </billing>
   </request>
 </requestblock>
 ```
 
-#### FILTER
+#### TRANSACTIONQUERY
 
 Parameters: 
 - filters - list of filter xml subtags. You may find full list of filters in this doc: [http://www.securetrading.com/support/document/xml-reference-transaction-query/](http://www.securetrading.com/support/document/xml-reference-transaction-query/)
 
 Example:
 
 ```ruby
-> filter = Securetrading::Filter.new({ transactionreference: [ '5-9-1982481', '5-9-1980795'] })
-> filter.perform
+> query = Securetrading::TransactionQuery.new(transactionreference: [ '5-9-1982481', '5-9-1980795'])
+> query.perform
 ```
 It will send post request with xml:
 
 ```XML
 <requestblock version=\"3.67\">
@@ -97,9 +97,17 @@
       <transactionreference>5-9-1980795</transactionreference>
     </filter>
   </request>
 </requestblock>
 ```
+
+#### SiteSecurity
+
+Helper class for sitesecurity value calculation.
+More details in [STPP-Payment-Pages-Setup-Guide-V2](http://www.securetrading.com/files/documentation/STPP-Payment-Pages-Setup-Guide-V2.pdf) chapter 6.
+
+Methods:
+ * hash(fields) - calculates SHA256 hash from fields. List of fields you can check in doc above.
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.