diff --git a/src/libcollections/vec.rs b/src/libcollections/vec.rs
index c8a8498d2f9..57c42b89afc 100644
--- a/src/libcollections/vec.rs
+++ b/src/libcollections/vec.rs
@@ -536,7 +536,7 @@ impl<T> Vec<T> {
     ///
     /// # Panics
     ///
-    /// Panics if `i` is out of bounds.
+    /// Panics if `index` is out of bounds.
     ///
     /// # Examples
     ///