diff --git a/README.md b/README.md
index 4a6e74f..c6ab390 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,2 @@
 # survey
-epoll(7) things for fun and profit
+low level linux io
diff --git a/src/sync_tcp.rs b/src/sync_tcp.rs
index b9bfd51..1fe53d5 100644
--- a/src/sync_tcp.rs
+++ b/src/sync_tcp.rs
@@ -4,7 +4,7 @@ use std::{
     io::{Read, Write},
     mem,
     mem::MaybeUninit,
-    os::unix,
+    os::{unix, unix::io::RawFd},
 };
 
 const SOCKADDR_IN_SIZE: libc::socklen_t = mem::size_of::<libc::sockaddr_in>() as _;
@@ -87,6 +87,12 @@ impl Debug for SyncTcpListener {
     }
 }
 
+impl unix::io::AsRawFd for SyncTcpListener {
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd
+    }
+}
+
 pub struct SyncTcpStream {
     fd: unix::io::RawFd,
     peer_sockaddr: libc::sockaddr_in,
@@ -134,6 +140,12 @@ impl Debug for SyncTcpStream {
     }
 }
 
+impl unix::io::AsRawFd for SyncTcpStream {
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd
+    }
+}
+
 fn format_addr(addr: libc::sockaddr_in) -> String {
     let bytes = addr.sin_addr.s_addr.to_be_bytes();
     format!(