diff --git a/library/std/src/sync/mpmc/mod.rs b/library/std/src/sync/mpmc/mod.rs
index 8712332dd2767..073c12cc4093a 100644
--- a/library/std/src/sync/mpmc/mod.rs
+++ b/library/std/src/sync/mpmc/mod.rs
@@ -9,6 +9,7 @@
 //! [`Sender`]s are used to send data to a set of [`Receiver`]s. Both
 //! sender and receiver are cloneable (multi-producer) such that many threads can send
 //! simultaneously to receivers (multi-consumer).
+//! Each item is delivered to (at most) one receiver.
 //!
 //! These channels come in two flavors:
 //!