diff --git a/talpid-tunnel-config-client/src/socket.rs b/talpid-tunnel-config-client/src/socket.rs
index 918e7576135b..78024f0f67e0 100644
--- a/talpid-tunnel-config-client/src/socket.rs
+++ b/talpid-tunnel-config-client/src/socket.rs
@@ -16,6 +16,7 @@ mod sys {
     /// we cannot lower it further. This causes the outer packets to be dropped. Also, MTU detection
     /// will likely occur after the PQ handshake, so we cannot assume that the MTU is already
     /// correctly configured.
+    /// This is set to the lowest possible IPv4 MTU.
     const CONFIG_CLIENT_MTU: u16 = 576;
 
     pub struct TcpSocket {