diff --git a/contracts/libraries/Strings.sol b/contracts/libraries/Strings.sol
index 521fbae..572920c 100755
--- a/contracts/libraries/Strings.sol
+++ b/contracts/libraries/Strings.sol
@@ -13,7 +13,7 @@ library Strings {
      * @dev Converts a `uint256` to its ASCII `string` decimal representation.
      */
     function toString(uint256 value) internal pure returns (string memory) {
-        // Inspired by OraclizeAPI's implementation - MIT licence
+        // Inspired by OraclizeAPI's implementation - MIT license
         // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
 
         if (value == 0) {
@@ -64,4 +64,4 @@ library Strings {
         require(value == 0, "Strings: hex length insufficient");
         return string(buffer);
     }
-}
\ No newline at end of file
+}
diff --git a/contracts/tokens/ERC20Standard.sol b/contracts/tokens/ERC20Standard.sol
index 0c327b9..34eac54 100755
--- a/contracts/tokens/ERC20Standard.sol
+++ b/contracts/tokens/ERC20Standard.sol
@@ -171,7 +171,7 @@ contract ERC20Standard is IERC20, IERC20Metadata {
      * Requirements:
      *
      * - `spender` cannot be the zero address.
-     * - `spender` must have allowance for the caller of at least
+     * - `spender` must have an allowance for the caller of at least
      * `subtractedValue`.
      */
     function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
@@ -356,4 +356,4 @@ contract ERC20Standard is IERC20, IERC20Metadata {
         address to,
         uint256 amount
     ) internal virtual {}
-}
\ No newline at end of file
+}
diff --git a/contracts/tokens/ERC677TestToken.sol b/contracts/tokens/ERC677TestToken.sol
index 0aed5ae..ab90ad4 100755
--- a/contracts/tokens/ERC677TestToken.sol
+++ b/contracts/tokens/ERC677TestToken.sol
@@ -44,7 +44,7 @@ contract ERC677TestToken is IERC677, ERC20TestToken {
 
     /**
      * @dev Transfer tokens from one address to another
-     * @param _from address The address which you want to send tokens from
+     * @param _from address The address to which you want to send tokens from
      * @param _to address The address which you want to transfer to
      * @param _value uint256 the amount of tokens to be transferred
      */