3 files changed, 4 insertions, 2 deletions
diff --git a/src/libstd/sync/future.rs b/src/libstd/sync/future.rs
index 76b07999280..f5b6650a498 100644
--- a/src/libstd/sync/future.rs
+++ b/src/libstd/sync/future.rs
@@ -14,7 +14,7 @@
 //! # Examples
 //!
 //! ```
-//! # #![feature(std_misc)]
+//! # #![feature(future)]
 //! use std::sync::Future;
 //!
 //! // a fake, for now
diff --git a/src/libstd/sync/mutex.rs b/src/libstd/sync/mutex.rs
index 5f77ee20545..1d630142959 100644
--- a/src/libstd/sync/mutex.rs
+++ b/src/libstd/sync/mutex.rs
@@ -85,6 +85,8 @@ use sys_common::poison::{self, TryLockError, TryLockResult, LockResult};
 /// To recover from a poisoned mutex:
 ///
 /// ```
+/// #![feature(sync_poison)]
+///
 /// use std::sync::{Arc, Mutex};
 /// use std::thread;
 ///
diff --git a/src/libstd/sync/semaphore.rs b/src/libstd/sync/semaphore.rs
index 0278a6c95b9..dc9e467a8b1 100644
--- a/src/libstd/sync/semaphore.rs
+++ b/src/libstd/sync/semaphore.rs
@@ -25,7 +25,7 @@ use sync::{Mutex, Condvar};
 /// # Examples
 ///
 /// ```
-/// # #![feature(std_misc)]
+/// # #![feature(semaphore)]
 /// use std::sync::Semaphore;
 ///
 /// // Create a semaphore that represents 5 resources