Update CHANGELOG.md

Co-authored-by: Francisco <frangio.1@gmail.com>

CHANGELOG.md

@@ -11,7 +11,12 @@
  * `ERC20`: Deleted `_beforeTokenTransfer` and `_afterTokenTransfer` hooks, and refactor all extensions using those hooks for customization, by using `transfer` instead. ([#3838](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3838))
 
 ### How to upgrade from 4.x
-These breaking changes will require additional modifications in your implementation of ERC20, ERC721, and ERC1155, since the `afterTokenTransfer` and `beforeTokenTransfer` were removed. Any customization made through those hooks should now use the `transfer` function instead, keeping in mind that `_mint` and `_burn` are no longer virtual, so they are not overridable.
+
+#### ERC20, ERC721, and ERC1155
+
+These breaking changes will require modifications to ERC20, ERC721, and ERC1155 contracts, since the `_afterTokenTransfer` and `_beforeTokenTransfer` functions were removed. Any customization made through those hooks should now be done overriding the `_transfer` function instead.
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+Minting and burning are implemented by `_transfer` and customizations should be done by overriding this function as well. `_mint` and `_burn` are no longer virtual (meaning they are not overridable) to guard against possible inconsistencies.
 
 For example, a contract using `ERC20`'s `_afterTokenTransfer` hook would have to be changed in the following way.