Update EIPS/eip-20.md

Co-authored-by: Sam Wilson <57262657+SamWilsn@users.noreply.github.com>
ethereum · Mar 3, 2023 · 23e1006 · 23e1006
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diff --git a/EIPS/eip-20.md b/EIPS/eip-20.md
@@ -108,6 +108,9 @@ function transferFrom(address _from, address _to, uint256 _value) public returns
 
 Allows `_spender` to withdraw from your account multiple times, up to the `_value` amount. If this function is called again it overwrites the current allowance with `_value`.
 
+clients SHOULD make sure to create user interfaces in such a way that they set the allowance first to `0` before setting it to another value for the same spender.
+THOUGH The contract itself shouldn't enforce it, to allow backwards compatibility with contracts deployed before
+
 **NOTE**: Please read the [Security Considerations](#security-considerations) section for potential attack vectors.
 
 ``` js