diff --git a/contracts/interfaces/IProtocolFee.sol b/contracts/interfaces/IProtocolFee.sol
index 4aa9e2e3..0cbcf9e9 100644
--- a/contracts/interfaces/IProtocolFee.sol
+++ b/contracts/interfaces/IProtocolFee.sol
@@ -22,7 +22,7 @@ import { Fee } from "../shared/Structs.sol";
 interface IProtocolFee {
     /**
      * @notice Sets protocol fee default value
-     * @param protocolFeeDefault New base fee defaul value
+     * @param protocolFeeDefault New base fee default value
      * @dev Can be called only by the owner
      */
     function setProtocolFeeDefault(Fee calldata protocolFeeDefault) external;
diff --git a/contracts/router/Router.sol b/contracts/router/Router.sol
index 6164c08d..05c0df36 100644
--- a/contracts/router/Router.sol
+++ b/contracts/router/Router.sol
@@ -221,7 +221,7 @@ contract Router is
     }
 
     /**
-     * @dev In ERC20 token case, transfers input token from the accound address to this contract,
+     * @dev In ERC20 token case, transfers input token from the account address to this contract,
      *     calls `permit()` function if allowance is not enough and permit call data is provided
      * @dev Checks `msg.value` in Ether case
      * @dev Does nothing in zero input token address case
@@ -252,7 +252,7 @@ contract Router is
     }
 
     /**
-     * @dev Transfers input token from the accound address to this contract,
+     * @dev Transfers input token from the account address to this contract,
      *     calls `permit()` function if allowance is not enough and permit call data is provided
      * @param token Token to be taken from the account address
      * @param amount Input token absolute amount to be taken from the account
diff --git a/contracts/router/SignatureVerifier.sol b/contracts/router/SignatureVerifier.sol
index 6d1695dc..721a4444 100644
--- a/contracts/router/SignatureVerifier.sol
+++ b/contracts/router/SignatureVerifier.sol
@@ -172,7 +172,7 @@ contract SignatureVerifier is ISignatureVerifier, EIP712 {
     /**
      * @param typehash The required signature typehash
      * @param input Input described in `hashDada()` function
-     * @param output Outut described in `hashDada()` function
+     * @param output Output described in `hashDada()` function
      * @param swapDescription Swap parameters described in `hashDada()` function
      * @param saltOrDeadline Salt/deadline parameter preventing double-spending
      * @return `execute()` function data hashed
diff --git a/docs/creating-your-adapters/read-only-adapters.md b/docs/creating-your-adapters/read-only-adapters.md
index e66db5bd..d2c3e1ed 100644
--- a/docs/creating-your-adapters/read-only-adapters.md
+++ b/docs/creating-your-adapters/read-only-adapters.md
@@ -2,7 +2,7 @@
 
 ## How to add your protocol to DeFi SDK
 
-Once a protocol is added to **ProtocolAdapterRegistry** contract, it will immediately appear in all the interfaces that use DeFi SDK \(including Zerion\). In order to add protocol to to DeFi SDK one has to implement the following contracts.
+Once a protocol is added to **ProtocolAdapterRegistry** contract, it will immediately appear in all the interfaces that use DeFi SDK \(including Zerion\). In order to add protocol to the DeFi SDK one has to implement the following contracts.
 
 ### `ProtocolAdapter`