diff --git a/contracts/TornadoPool.sol b/contracts/TornadoPool.sol
index 886f26d..51cd01b 100644
--- a/contracts/TornadoPool.sol
+++ b/contracts/TornadoPool.sol
@@ -19,6 +19,9 @@ import { CrossChainGuard } from "./bridge/CrossChainGuard.sol";
 import { IVerifier } from "./interfaces/IVerifier.sol";
 import "./MerkleTreeWithHistory.sol";
 
+/** @dev This contract(pool) allows deposit of an arbitrary amount to it, shielded transfer to another registered user inside the pool
+ * and withdrawal from the pool. Project utilizes UTXO model to handle users' funds.
+ */
 contract TornadoPool is MerkleTreeWithHistory, IERC20Receiver, ReentrancyGuard, CrossChainGuard {
   int256 public constant MAX_EXT_AMOUNT = 2**248;
   uint256 public constant MAX_FEE = 2**248;
@@ -71,6 +74,13 @@ contract TornadoPool is MerkleTreeWithHistory, IERC20Receiver, ReentrancyGuard,
     @dev The constructor
     @param _verifier2 the address of SNARK verifier for 2 inputs
     @param _verifier16 the address of SNARK verifier for 16 inputs
+    @param _levels hight of the commitments merkle tree
+    @param _hasher hasher address for the merkle tree
+    @param _token token address for the pool
+    @param _omniBridge omniBridge address for specified token
+    @param _l1Unwrapper address of the L1Helper
+    @param _governance owner address
+    @param _l1ChainId chain id of L1
   */
   constructor(
     IVerifier _verifier2,
@@ -98,6 +108,8 @@ contract TornadoPool is MerkleTreeWithHistory, IERC20Receiver, ReentrancyGuard,
     super._initialize();
   }
 
+  /** @dev Main function that allows deposits, transfers and withdrawal.
+   */
   function transact(Proof memory _args, ExtData memory _extData) public {
     if (_extData.extAmount > 0) {
       // for deposits from L2
diff --git a/contracts/bridge/CrossChainGuard.sol b/contracts/bridge/CrossChainGuard.sol
index eab9c91..aceeee2 100644
--- a/contracts/bridge/CrossChainGuard.sol
+++ b/contracts/bridge/CrossChainGuard.sol
@@ -3,6 +3,9 @@ pragma solidity ^0.7.0;
 
 import { IAMB } from "../interfaces/IBridge.sol";
 
+/** @dev Special cross chain guard that can authorize caller as owner of this contract according to XDAI AMB bridge protocol.
+ * more info here https://docs.tokenbridge.net/amb-bridge/development-of-a-cross-chain-application/how-to-develop-xchain-apps-by-amb#receive-a-method-call-from-the-amb-bridge
+ */
 contract CrossChainGuard {
   IAMB public immutable ambBridge;
   bytes32 public immutable ownerChainId;
diff --git a/contracts/bridge/L1Helper.sol b/contracts/bridge/L1Helper.sol
index 5831736..4526c93 100644
--- a/contracts/bridge/L1Helper.sol
+++ b/contracts/bridge/L1Helper.sol
@@ -1,4 +1,15 @@
 // SPDX-License-Identifier: MIT
+// https://tornado.cash
+/*
+ * d888888P                                           dP              a88888b.                   dP
+ *    88                                              88             d8'   `88                   88
+ *    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.
+ *    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88
+ *    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88
+ *    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP
+ * ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
+ */
+
 pragma solidity ^0.7.0;
 pragma abicoder v2;