diff --git a/contracts/contracts/AdditionalZkSync.sol b/contracts/contracts/AdditionalZkSync.sol
index b2738b2a35..6b8c61edaa 100644
--- a/contracts/contracts/AdditionalZkSync.sol
+++ b/contracts/contracts/AdditionalZkSync.sol
@@ -47,7 +47,7 @@ contract AdditionalZkSync is Storage, Config, Events, ReentrancyGuard {
         address _nftCreatorAddress,
         uint32 _nftSerialId,
         bytes32 _nftContentHash,
-        uint256[] memory _proof
+        uint256[] calldata _proof
     ) external {
         require(_accountId <= MAX_ACCOUNT_ID, "e");
         require(_accountId != SPECIAL_ACCOUNT_ID, "v");
@@ -91,7 +91,7 @@ contract AdditionalZkSync is Storage, Config, Events, ReentrancyGuard {
         performedExodus[_accountId][_tokenId] = true;
     }
 
-    function cancelOutstandingDepositsForExodusMode(uint64 _n, bytes[] memory _depositsPubdata) external {
+    function cancelOutstandingDepositsForExodusMode(uint64 _n, bytes[] calldata _depositsPubdata) external {
         require(exodusMode, "8"); // exodus mode not active
         uint64 toProcess = Utils.minU64(totalOpenPriorityRequests, _n);
         require(toProcess > 0, "9"); // no deposits to process
@@ -114,6 +114,9 @@ contract AdditionalZkSync is Storage, Config, Events, ReentrancyGuard {
 
     uint256 internal constant SECURITY_COUNCIL_THRESHOLD = $$(SECURITY_COUNCIL_THRESHOLD);
 
+    /// @notice processing new approval of decrease upgrade notice period time to zero
+    /// @param addr address of the account that approved the reduction of the upgrade notice period to zero
+    /// NOTE: does NOT revert if the address is not a security council member or number of approvals is already sufficient
     function approveCutUpgradeNoticePeriod(address addr) internal {
         address payable[SECURITY_COUNCIL_MEMBERS_NUMBER] memory SECURITY_COUNCIL_MEMBERS = [
             $(SECURITY_COUNCIL_MEMBERS)
@@ -124,7 +127,7 @@ contract AdditionalZkSync is Storage, Config, Events, ReentrancyGuard {
                 numberOfApprovalsFromSecurityCouncil += 1;
                 emit ApproveCutUpgradeNoticePeriod(addr);
 
-                if (numberOfApprovalsFromSecurityCouncil == SECURITY_COUNCIL_THRESHOLD) {
+                if (numberOfApprovalsFromSecurityCouncil >= SECURITY_COUNCIL_THRESHOLD) {
                     if (approvedUpgradeNoticePeriod > 0) {
                         approvedUpgradeNoticePeriod = 0;
                         emit NoticePeriodChange(approvedUpgradeNoticePeriod);
@@ -209,7 +212,7 @@ contract AdditionalZkSync is Storage, Config, Events, ReentrancyGuard {
     }
 
     /// @notice Reverts unverified blocks
-    function revertBlocks(StoredBlockInfo[] memory _blocksToRevert) external {
+    function revertBlocks(StoredBlockInfo[] calldata _blocksToRevert) external {
         requireActive();
 
         governance.requireActiveValidator(msg.sender);
diff --git a/contracts/contracts/IERC20.sol b/contracts/contracts/IERC20.sol
index 6501389ea1..a9bda5c8d5 100644
--- a/contracts/contracts/IERC20.sol
+++ b/contracts/contracts/IERC20.sol
@@ -77,7 +77,7 @@ interface IERC20 {
 
 /// @dev Interface of the ERC20 standard as defined in the EIP.
 /// 1. Implements only `transfer` and `transferFrom` methods
-/// 2. These methods return a boolean which indicates success of the transaction
+/// 2. These methods return a boolean value which indicates success of the transaction
 /// Note: It is assumed that the interface applies to those `ERC20` tokens whose code exactly matches the standard.
 /// Note: Used to perform transfers for tokens that explicitly return a boolean value
 /// (if the token returns any other data or does not return at all, then the function call will reverted)
diff --git a/contracts/contracts/Verifier.sol b/contracts/contracts/Verifier.sol
index 8b65726f13..c6f82d222b 100644
--- a/contracts/contracts/Verifier.sol
+++ b/contracts/contracts/Verifier.sol
@@ -18,7 +18,7 @@ contract Verifier is KeysWithPlonkVerifier, KeysWithPlonkVerifierOld, Config {
 
     function verifyAggregatedBlockProof(
         uint256[] memory _recursiveInput,
-        uint256[] memory _proof,
+        uint256[] calldata _proof,
         uint8[] memory _vkIndexes,
         uint256[] memory _individualVksInputs,
         uint256[16] memory _subproofsLimbs
diff --git a/contracts/contracts/ZkSync.sol b/contracts/contracts/ZkSync.sol
index 3e423ee955..ab397e6f32 100644
--- a/contracts/contracts/ZkSync.sol
+++ b/contracts/contracts/ZkSync.sol
@@ -201,7 +201,7 @@ contract ZkSync is UpgradeableMaster, Storage, Config, Events, ReentrancyGuard {
     /// @dev WARNING: Only for Exodus mode
     /// @dev Canceling may take several separate transactions to be completed
     /// @param _n number of requests to process
-    function cancelOutstandingDepositsForExodusMode(uint64 _n, bytes[] memory _depositsPubdata) external {
+    function cancelOutstandingDepositsForExodusMode(uint64 _n, bytes[] calldata _depositsPubdata) external {
         // All functions delegated to additional contract should NOT be nonReentrant
         delegateAdditional();
     }
@@ -603,7 +603,7 @@ contract ZkSync is UpgradeableMaster, Storage, Config, Events, ReentrancyGuard {
     }
 
     /// @notice Reverts unverified blocks
-    function revertBlocks(StoredBlockInfo[] memory _blocksToRevert) external {
+    function revertBlocks(StoredBlockInfo[] calldata _blocksToRevert) external {
         // All functions delegated to additional contract should NOT be nonReentrant
         delegateAdditional();
     }
@@ -645,7 +645,7 @@ contract ZkSync is UpgradeableMaster, Storage, Config, Events, ReentrancyGuard {
         address _nftCreatorAddress,
         uint32 _nftSerialId,
         bytes32 _nftContentHash,
-        uint256[] memory _proof
+        uint256[] calldata _proof
     ) external {
         // All functions delegated to additional should NOT be nonReentrant
         delegateAdditional();