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1 files changed, 3 insertions, 2 deletions

diff --git a/src/libcore/iter/traits/exact_size.rs b/src/libcore/iter/traits/exact_size.rs
index 946c3f85824..ad87d09588e 100644
--- a/src/libcore/iter/traits/exact_size.rs
+++ b/src/libcore/iter/traits/exact_size.rs
@@ -69,9 +69,10 @@
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait ExactSizeIterator: Iterator {
-    /// Returns the exact length of the iterator, which is the number of times
-    /// the iterator will return `Some(T)` before returning `None`.
+    /// Returns the exact length of the iterator.
     ///
+    /// The implementation ensures that the iterator will return exactly `len()`
+    /// more times a `Some(T)` value, before returning `None`.
     /// This method has a default implementation, so you usually should not
     /// implement it directly. However, if you can provide a more efficient
     /// implementation, you can do so. See the [trait-level] docs for an