diff --git a/src/libstd/time.rs b/src/libstd/time.rs
index aeaa30462744..1215302757c3 100644
--- a/src/libstd/time.rs
+++ b/src/libstd/time.rs
@@ -271,6 +271,7 @@ impl SystemTime {
     /// # Examples
     ///
     /// ```no_run
+    /// #![feature(assoc_unix_epoch)]
     /// use std::time::SystemTime;
     ///
     /// match SystemTime::now().duration_since(SystemTime::UNIX_EPOCH) {