diff --git a/library/std/src/fs.rs b/library/std/src/fs.rs
index 2c04481c04ec0..bdb172907ffed 100644
--- a/library/std/src/fs.rs
+++ b/library/std/src/fs.rs
@@ -587,6 +587,12 @@ impl File {
     }
 }
 
+// In addition to the `impl`s here, `File` also has `impl`s for
+// `AsFd`/`From<OwnedFd>`/`Into<OwnedFd>` and
+// `AsRawFd`/`IntoRawFd`/`FromRawFd`, on Unix and WASI, and
+// `AsHandle`/`From<OwnedHandle>`/`Into<OwnedHandle>` and
+// `AsRawHandle`/`IntoRawHandle`/`FromRawHandle` on Windows.
+
 impl AsInner<fs_imp::File> for File {
     fn as_inner(&self) -> &fs_imp::File {
         &self.inner
diff --git a/library/std/src/net/tcp.rs b/library/std/src/net/tcp.rs
index 325acf0b97931..7f964e5c5a917 100644
--- a/library/std/src/net/tcp.rs
+++ b/library/std/src/net/tcp.rs
@@ -546,6 +546,12 @@ impl TcpStream {
     }
 }
 
+// In addition to the `impl`s here, `TcpStream` also has `impl`s for
+// `AsFd`/`From<OwnedFd>`/`Into<OwnedFd>` and
+// `AsRawFd`/`IntoRawFd`/`FromRawFd`, on Unix and WASI, and
+// `AsSocket`/`From<OwnedSocket>`/`Into<OwnedSocket>` and
+// `AsRawSocket`/`IntoRawSocket`/`FromRawSocket` on Windows.
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Read for TcpStream {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
@@ -908,6 +914,12 @@ impl TcpListener {
     }
 }
 
+// In addition to the `impl`s here, `TcpListener` also has `impl`s for
+// `AsFd`/`From<OwnedFd>`/`Into<OwnedFd>` and
+// `AsRawFd`/`IntoRawFd`/`FromRawFd`, on Unix and WASI, and
+// `AsSocket`/`From<OwnedSocket>`/`Into<OwnedSocket>` and
+// `AsRawSocket`/`IntoRawSocket`/`FromRawSocket` on Windows.
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a> Iterator for Incoming<'a> {
     type Item = io::Result<TcpStream>;
diff --git a/library/std/src/net/udp.rs b/library/std/src/net/udp.rs
index d2088a12b2c7d..871505843af23 100644
--- a/library/std/src/net/udp.rs
+++ b/library/std/src/net/udp.rs
@@ -779,6 +779,12 @@ impl UdpSocket {
     }
 }
 
+// In addition to the `impl`s here, `UdpSocket` also has `impl`s for
+// `AsFd`/`From<OwnedFd>`/`Into<OwnedFd>` and
+// `AsRawFd`/`IntoRawFd`/`FromRawFd`, on Unix and WASI, and
+// `AsSocket`/`From<OwnedSocket>`/`Into<OwnedSocket>` and
+// `AsRawSocket`/`IntoRawSocket`/`FromRawSocket` on Windows.
+
 impl AsInner<net_imp::UdpSocket> for UdpSocket {
     fn as_inner(&self) -> &net_imp::UdpSocket {
         &self.0
diff --git a/library/std/src/process.rs b/library/std/src/process.rs
index f5ce5210f8154..c9b21fcf9c6d2 100644
--- a/library/std/src/process.rs
+++ b/library/std/src/process.rs
@@ -258,6 +258,12 @@ pub struct ChildStdin {
     inner: AnonPipe,
 }
 
+// In addition to the `impl`s here, `ChildStdin` also has `impl`s for
+// `AsFd`/`From<OwnedFd>`/`Into<OwnedFd>` and
+// `AsRawFd`/`IntoRawFd`/`FromRawFd`, on Unix and WASI, and
+// `AsHandle`/`From<OwnedHandle>`/`Into<OwnedHandle>` and
+// `AsRawHandle`/`IntoRawHandle`/`FromRawHandle` on Windows.
+
 #[stable(feature = "process", since = "1.0.0")]
 impl Write for ChildStdin {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
@@ -335,6 +341,12 @@ pub struct ChildStdout {
     inner: AnonPipe,
 }
 
+// In addition to the `impl`s here, `ChildStdout` also has `impl`s for
+// `AsFd`/`From<OwnedFd>`/`Into<OwnedFd>` and
+// `AsRawFd`/`IntoRawFd`/`FromRawFd`, on Unix and WASI, and
+// `AsHandle`/`From<OwnedHandle>`/`Into<OwnedHandle>` and
+// `AsRawHandle`/`IntoRawHandle`/`FromRawHandle` on Windows.
+
 #[stable(feature = "process", since = "1.0.0")]
 impl Read for ChildStdout {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
@@ -396,6 +408,12 @@ pub struct ChildStderr {
     inner: AnonPipe,
 }
 
+// In addition to the `impl`s here, `ChildStderr` also has `impl`s for
+// `AsFd`/`From<OwnedFd>`/`Into<OwnedFd>` and
+// `AsRawFd`/`IntoRawFd`/`FromRawFd`, on Unix and WASI, and
+// `AsHandle`/`From<OwnedHandle>`/`Into<OwnedHandle>` and
+// `AsRawHandle`/`IntoRawHandle`/`FromRawHandle` on Windows.
+
 #[stable(feature = "process", since = "1.0.0")]
 impl Read for ChildStderr {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {