diff --git a/tonic/src/transport/channel/endpoint.rs b/tonic/src/transport/channel/endpoint.rs
index e0a4965..3a0b5b8 100644
--- a/tonic/src/transport/channel/endpoint.rs
+++ b/tonic/src/transport/channel/endpoint.rs
@@ -113,6 +113,14 @@ impl Endpoint {
     /// # let mut builder = Endpoint::from_static("https://example.com");
     /// builder.timeout(Duration::from_secs(5));
     /// ```
+    ///
+    /// # Notes
+    ///
+    /// This does **not** set the timeout metadata (`grpc-timeout` header) on
+    /// the request, meaning the server will not be informed of this timeout,
+    /// for that use [`Request::set_timeout`].
+    ///
+    /// [`Request::set_timeout`]: crate::Request::set_timeout
     pub fn timeout(self, dur: Duration) -> Self {
         Endpoint {
             timeout: Some(dur),