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-rw-r--r--src/liballoc/rc.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index d582de5740c..b505162dc0a 100644
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -10,7 +10,8 @@
 
 #![allow(deprecated)]
 
-//! Unsynchronized reference-counted boxes (the `Rc<T>` type).
+//! Unsynchronized reference-counted boxes (the `Rc<T>` type) which are usable
+//! only within a single thread.
 //!
 //! The `Rc<T>` type provides shared ownership of an immutable value.
 //! Destruction is deterministic, and will occur as soon as the last owner is