diff --git a/contracts/helpers/ValidatorsOperations.sol b/contracts/helpers/ValidatorsOperations.sol
index fafba7f..519e288 100644
--- a/contracts/helpers/ValidatorsOperations.sol
+++ b/contracts/helpers/ValidatorsOperations.sol
@@ -51,6 +51,12 @@ contract ValidatorsOperations is Initializable {
         howManyValidatorsDecide = 1;
     }
 
+    // PUBLIC METHODS
+    modifier existValidator(address wallet) {
+        require(isExistValidator(wallet), "Address is not Validator");
+        _;
+    }
+
     // PUBLIC METHODS
     /**
     * @dev Allows validators to change their mind by cancelling votesMaskByOperation operations
@@ -84,7 +90,7 @@ contract ValidatorsOperations is Initializable {
     * @param newValidators defines array of addresses of new validators
     * @param newHowManyValidatorsDecide defines how many validators can decide
     */
-    function changeValidatorsWithHowMany(address[] memory newValidators, uint256 newHowManyValidatorsDecide) internal {
+    function changeValidatorsWithHowMany(address[] memory newValidators, uint256 newHowManyValidatorsDecide) public {
         require(newValidators.length > 0, "changeValidatorsWithHowMany: validators array is empty");
         require(newValidators.length < 256, "changeValidatorsWithHowMany: validators count is greater then 255");
         require(newHowManyValidatorsDecide > 0, "changeValidatorsWithHowMany: newHowManyValidatorsDecide equal to 0");
@@ -122,11 +128,6 @@ contract ValidatorsOperations is Initializable {
         return validatorsIndices[wallet] > 0;
     }
 
-    modifier existValidator(address wallet) {
-        require(isExistValidator(wallet), "Address is not Validator");
-        _;
-    }
-    
     function validatorsCount() public view returns(uint) {
         return validators.length;
     }
@@ -299,4 +300,6 @@ contract ValidatorsOperations is Initializable {
         delete allOperationsIndicies[operation];
         delete operationsByValidatorIndex[operation];
     }
+
+   
 }
\ No newline at end of file
diff --git a/types/truffle-contracts/index.d.ts b/types/truffle-contracts/index.d.ts
index e326676..68bb99d 100644
--- a/types/truffle-contracts/index.d.ts
+++ b/types/truffle-contracts/index.d.ts
@@ -117,6 +117,29 @@ export interface BridgeInstance extends Truffle.ContractInstance {
     ): Promise<number>;
   };
 
+  changeValidatorsWithHowMany: {
+    (
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<Truffle.TransactionResponse>;
+    call(
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<void>;
+    sendTransaction(
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<string>;
+    estimateGas(
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<number>;
+  };
+
   getGuestAddress(
     host: string | BigNumber,
     txDetails?: Truffle.TransactionDetails
@@ -1394,6 +1417,29 @@ export interface ValidatorsOperationsInstance extends Truffle.ContractInstance {
     ): Promise<number>;
   };
 
+  changeValidatorsWithHowMany: {
+    (
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<Truffle.TransactionResponse>;
+    call(
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<void>;
+    sendTransaction(
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<string>;
+    estimateGas(
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<number>;
+  };
+
   cancelAllPending: {
     (txDetails?: Truffle.TransactionDetails): Promise<
       Truffle.TransactionResponse
@@ -1478,6 +1524,29 @@ export interface ValidatorsOperationsMockInstance
     ): Promise<number>;
   };
 
+  changeValidatorsWithHowMany: {
+    (
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<Truffle.TransactionResponse>;
+    call(
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<void>;
+    sendTransaction(
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<string>;
+    estimateGas(
+      newValidators: (string | BigNumber)[],
+      newHowManyValidatorsDecide: number | BigNumber | string,
+      txDetails?: Truffle.TransactionDetails
+    ): Promise<number>;
+  };
+
   howManyValidatorsDecide(
     txDetails?: Truffle.TransactionDetails
   ): Promise<BigNumber>;