diff --git a/protocol/Cargo.toml b/protocol/Cargo.toml
index d439ab6..f63178b 100644
--- a/protocol/Cargo.toml
+++ b/protocol/Cargo.toml
@@ -27,6 +27,7 @@ bitcoin_hashes = { version ="0.15.0", default-features = false }
 chacha20-poly1305 = { version = "0.1.1", default-features = false }
 
 [dev-dependencies]
+# bitcoind version 26.0 includes support for BIP324's V2 protocol, but it is disabled by default.
 bitcoind = { package = "bitcoind-json-rpc-regtest", version = "0.3.0", default-features = false, features = ["26_0"] }
 hex = { package = "hex-conservative", version = "0.2.0" }
 
diff --git a/protocol/tests/round_trips.rs b/protocol/tests/round_trips.rs
index 356a02e..ab298f7 100644
--- a/protocol/tests/round_trips.rs
+++ b/protocol/tests/round_trips.rs
@@ -82,7 +82,9 @@ fn regtest_handshake() {
 
     let exe_path = bitcoind::exe_path().unwrap();
     let mut conf = bitcoind::Conf::default();
-    conf.args = vec!["-v2transport=1", "-regtest"];
+    // Enable BIP324's V2 protocol.
+    conf.args.push("-v2transport=1");
+    // Enable the P2P port for the test.
     conf.p2p = bitcoind::P2P::Yes;
     let bitcoind = bitcoind::BitcoinD::with_conf(exe_path, &conf).unwrap();