diff --git a/src/libcore/option.rs b/src/libcore/option.rs
index b8fe28d0f0d7..96b551d8704a 100644
--- a/src/libcore/option.rs
+++ b/src/libcore/option.rs
@@ -233,10 +233,10 @@ impl<T> Option<T> {
     /// [`usize`]: ../../std/primitive.usize.html
     ///
     /// ```
-    /// let num_as_str: Option<String> = Some("10".to_string());
+    /// let num_as_str: Option<String> = Some("12".to_string());
     /// // First, cast `Option<String>` to `Option<&String>` with `as_ref`,
     /// // then consume *that* with `map`, leaving `num_as_str` on the stack.
-    /// let num_as_int: Option<usize> = num_as_str.as_ref().map(|n| n.len());
+    /// let num_length: Option<usize> = num_as_str.as_ref().map(|n| n.len());
     /// println!("still can print num_as_str: {:?}", num_as_str);
     /// ```
     #[inline]