diff --git a/contracts/token/ERC20/extensions/ERC20Votes.sol b/contracts/token/ERC20/extensions/ERC20Votes.sol
index 3a3d959a1..38d2e208b 100644
--- a/contracts/token/ERC20/extensions/ERC20Votes.sol
+++ b/contracts/token/ERC20/extensions/ERC20Votes.sol
@@ -59,19 +59,27 @@ abstract contract ERC20Votes is IERC20Votes, ERC20Permit {
     }
 
     /**
-     * @dev Determine the number of votes for `account` at the begining of `blockNumber`.
+     * @dev Retrieve the number of votes for `account` at the end of `blockNumber`.
+     *
+     * Requirements:
+     *
+     * - `blockNumber` must have been already mined
      */
     function getPriorVotes(address account, uint256 blockNumber) external view override returns (uint256) {
-        require(blockNumber < block.number, "ERC20Votes::getPriorVotes: not yet determined");
+        require(blockNumber < block.number, "ERC20Votes: block not yet mined");
         return _checkpointsLookup(_checkpoints[account], blockNumber);
     }
 
     /**
-     * @dev Determine the totalSupply at the begining of `blockNumber`. Note, this value is the sum of all balances.
+     * @dev Retrieve the `totalSupply` at the end of `blockNumber`. Note, this value is the sum of all balances.
      * It is but NOT the sum of all the delegated votes!
+     *
+     * Requirements:
+     *
+     * - `blockNumber` must have been already mined
      */
-    function getPriorTotalSupply(uint256 blockNumber) external view override returns(uint256) {
-        require(blockNumber < block.number, "ERC20Votes::getPriorTotalSupply: not yet determined");
+    function getPriorTotalSupply(uint256 blockNumber) external view override returns (uint256) {
+        require(blockNumber < block.number, "ERC20Votes: block not yet mined");
         return _checkpointsLookup(_totalSupplyCheckpoints, blockNumber);
     }
 
@@ -117,7 +125,7 @@ abstract contract ERC20Votes is IERC20Votes, ERC20Permit {
     function delegateBySig(address delegatee, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s)
         public virtual override
     {
-        require(block.timestamp <= expiry, "ERC20Votes::delegateBySig: signature expired");
+        require(block.timestamp <= expiry, "ERC20Votes: signature expired");
         address signer = ECDSA.recover(
             _hashTypedDataV4(keccak256(abi.encode(
                 _DELEGATION_TYPEHASH,
@@ -127,7 +135,7 @@ abstract contract ERC20Votes is IERC20Votes, ERC20Permit {
             ))),
             v, r, s
         );
-        require(nonce == _useNonce(signer), "ERC20Votes::delegateBySig: invalid nonce");
+        require(nonce == _useNonce(signer), "ERC20Votes: invalid nonce");
         return _delegate(signer, delegatee);
     }
 
diff --git a/test/token/ERC20/extensions/ERC20Votes.test.js b/test/token/ERC20/extensions/ERC20Votes.test.js
index 588b7f92c..5598d4d89 100644
--- a/test/token/ERC20/extensions/ERC20Votes.test.js
+++ b/test/token/ERC20/extensions/ERC20Votes.test.js
@@ -192,7 +192,7 @@ contract('ERC20Votes', function (accounts) {
 
         await expectRevert(
           this.token.delegateBySig(delegatorAddress, nonce, MAX_UINT256, v, r, s),
-          'ERC20Votes::delegateBySig: invalid nonce',
+          'ERC20Votes: invalid nonce',
         );
       });
 
@@ -224,7 +224,7 @@ contract('ERC20Votes', function (accounts) {
         ));
         await expectRevert(
           this.token.delegateBySig(delegatorAddress, nonce + 1, MAX_UINT256, v, r, s),
-          'ERC20Votes::delegateBySig: invalid nonce',
+          'ERC20Votes: invalid nonce',
         );
       });
 
@@ -241,7 +241,7 @@ contract('ERC20Votes', function (accounts) {
 
         await expectRevert(
           this.token.delegateBySig(delegatorAddress, nonce, expiry, v, r, s),
-          'ERC20Votes::delegateBySig: signature expired',
+          'ERC20Votes: signature expired',
         );
       });
     });
@@ -411,7 +411,7 @@ contract('ERC20Votes', function (accounts) {
       it('reverts if block number >= current block', async function () {
         await expectRevert(
           this.token.getPriorVotes(other1, 5e10),
-          'ERC20Votes::getPriorVotes: not yet determined',
+          'ERC20Votes: block not yet mined',
         );
       });
 
@@ -473,7 +473,7 @@ contract('ERC20Votes', function (accounts) {
     it('reverts if block number >= current block', async function () {
       await expectRevert(
         this.token.getPriorTotalSupply(5e10),
-        'ERC20Votes::getPriorTotalSupply: not yet determined',
+        'ERC20Votes: block not yet mined',
       );
     });