diff --git a/src/client/conn.rs b/src/client/conn.rs
index 70c1dad248..63bd21ba99 100644
--- a/src/client/conn.rs
+++ b/src/client/conn.rs
@@ -89,6 +89,9 @@ where
 
 /// Returns a handshake future over some IO.
 ///
+/// The io parameter will usually be a
+/// [tokio::net::TcpStream](https://docs.rs/tokio/latest/tokio/net/struct.TcpStream.html).
+///
 /// This is a shortcut for `Builder::new().handshake(io)`.
 pub async fn handshake<T>(
     io: T,
@@ -106,6 +109,9 @@ pub struct SendRequest<B> {
 
 /// A future that processes all HTTP state for the IO object.
 ///
+/// The io parameter will usually be a
+/// [tokio::net::TcpStream](https://docs.rs/tokio/latest/tokio/net/struct.TcpStream.html).
+///
 /// In most cases, this should just be spawned into an executor, so that it
 /// can process incoming and outgoing messages, notice hangups, and the like.
 #[must_use = "futures do nothing unless polled"]