[PAN-2343] docs

ethereum/permissioning/src/main/java/tech/pegasys/pantheon/ethereum/permissioning/SmartContractPermissioningController.java

@@ -27,6 +27,11 @@
 import java.net.InetAddress;
 import java.util.Optional;
 
+/**
+ * Controller that can read from a smart contract that exposes the permissioning calls
+ * connectionAllowedIpv4(bytes32,bytes32,bytes4,uint16,bytes32,bytes32,bytes4,uint16)
+ * connectionAllowedIpv6(bytes32,bytes32,bytes16,uint16,bytes32,bytes32,bytes16,uint16)
+ */
 public class SmartContractPermissioningController implements NodePermissioningProvider {
  private final Address contractAddress;
  private final TransactionSimulator transactionSimulator;