README.md in dns_mock-1.2.4 vs README.md in dns_mock-1.3.0

@@ -88,10 +88,12 @@
 # Main DnsMock interface
 # records:Hash, port:Integer, exception_if_not_found:Boolean
 # are optional params. By default creates dns mock server with
 # empty records. A free port for server will be randomly assigned
 # in the range from 49152 to 65535, if record not found exception
-# won't raises. Returns current dns mock server
+# won't raises. Please note if you specify zero port number,
+# free port number will be randomly assigned as a server port too.
+# Returns current dns mock server
 dns_mock_server = DnsMock.start_server(records: records) # => DnsMock::Server instance
 
 # returns current dns mock server port
 dns_mock_server.port # => 49322