diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index 7a85e588662..d46cf7a26da 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -437,7 +437,10 @@ pub fn env<K, V>(&mut self, key: K, val: V) -> &mut Command
     /// # Examples
     ///
     /// Basic usage:
+    ///
     /// ```no_run
+    /// #![feature(command_envs)]
+    ///
     /// use std::process::{Command, Stdio};
     /// use std::env;
     /// use std::collections::HashMap;