diff --git a/src/libcore/sync/atomic.rs b/src/libcore/sync/atomic.rs
index 658b1312c496..47d9deb62ff6 100644
--- a/src/libcore/sync/atomic.rs
+++ b/src/libcore/sync/atomic.rs
@@ -289,7 +289,7 @@ pub fn compare_and_swap(&self, current: bool, new: bool, order: Ordering) -> boo
     /// Stores a value into the `bool` if the current value is the same as the `current` value.
     ///
     /// The return value is a result indicating whether the new value was written and containing
-    /// the previous value. On success this value is guaranteed to be equal to `new`.
+    /// the previous value. On success this value is guaranteed to be equal to `current`.
     ///
     /// `compare_exchange` takes two `Ordering` arguments to describe the memory ordering of this
     /// operation. The first describes the required ordering if the operation succeeds while the
@@ -633,7 +633,7 @@ pub fn compare_and_swap(&self, current: *mut T, new: *mut T, order: Ordering) ->
     /// Stores a value into the pointer if the current value is the same as the `current` value.
     ///
     /// The return value is a result indicating whether the new value was written and containing
-    /// the previous value. On success this value is guaranteed to be equal to `new`.
+    /// the previous value. On success this value is guaranteed to be equal to `current`.
     ///
     /// `compare_exchange` takes two `Ordering` arguments to describe the memory ordering of this
     /// operation. The first describes the required ordering if the operation succeeds while the
@@ -886,7 +886,7 @@ pub fn compare_and_swap(&self,
             ///
             /// The return value is a result indicating whether the new value was written and
             /// containing the previous value. On success this value is guaranteed to be equal to
-            /// `new`.
+            /// `current`.
             ///
             /// `compare_exchange` takes two `Ordering` arguments to describe the memory ordering of
             /// this operation. The first describes the required ordering if the operation succeeds