doc: Add a TODO to the network protocol
@@ -39,7 +39,8 @@ impl Version {
/// Returns the minimum network protocol version for `network` and
/// `network_upgrade`.
pub fn min_version(network: Network, network_upgrade: NetworkUpgrade) -> Self {
- // We might not ever use these older versions.
+ // TODO: Should we reject earlier protocol versions during our initial
+ // sync? zcashd accepts 170_002 or later during its initial sync.
Version(match (network, network_upgrade) {
(_, BeforeOverwinter) => 170_002,
(Testnet, Overwinter) => 170_003,
