diff --git a/src/libcore/cell.rs b/src/libcore/cell.rs
index 789b75836d0a70a43db847db7014d03f804e5c92..6041355e9dbc0d861d8a3584038e509725ac7e2b 100644
--- a/src/libcore/cell.rs
+++ b/src/libcore/cell.rs
@@ -414,7 +414,9 @@ pub fn borrow(&self) -> Ref<T> {
     ///
     /// let c = RefCell::new(5);
     ///
-    /// let borrowed_five = c.borrow_mut();
+    /// *c.borrow_mut() = 7;
+    ///
+    /// assert_eq!(*c.borrow(), 7);
     /// ```
     ///
     /// An example of panic: