diff --git a/src/libstd/iterator.rs b/src/libstd/iterator.rs
index bed74eba604..eedabadf74c 100644
--- a/src/libstd/iterator.rs
+++ b/src/libstd/iterator.rs
@@ -38,7 +38,7 @@ pub trait Iterator {
///
/// In the future these will be default methods instead of a utility trait.
pub trait IteratorUtil {
- /// Chan this iterator with another, returning a new iterator which will
+ /// Chain this iterator with another, returning a new iterator which will
/// finish iterating over the current iterator, and then it will iterate
/// over the other specified iterator.
///
@@ -108,7 +108,7 @@ pub trait IteratorUtil {
/// ~~~
fn filter<'r>(self, predicate: &'r fn(&A) -> bool) -> FilterIterator<'r, A, Self>;
- /// Creates an iterator which both filters and maps elements at the same
+ /// Creates an iterator which both filters and maps elements.
/// If the specified function returns None, the element is skipped.
/// Otherwise the option is unwrapped and the new value is yielded.
///
@@ -141,7 +141,7 @@ pub trait IteratorUtil {
fn enumerate(self) -> EnumerateIterator;
/// Creates an iterator which invokes the predicate on elements until it
- /// returns true. Once the predicate returns true, all further elements are
+ /// returns false. Once the predicate returns false, all further elements are
/// yielded.
///
/// # Example