diff --git a/library/alloc/src/vec/mod.rs b/library/alloc/src/vec/mod.rs
index f3a30d09825..ec7490328b2 100644
--- a/library/alloc/src/vec/mod.rs
+++ b/library/alloc/src/vec/mod.rs
@@ -2188,7 +2188,12 @@ pub fn extend_from_slice(&mut self, other: &[T]) {
 
     /// Copies elements from `src` range to the end of the vector.
     ///
-    /// ## Examples
+    /// # Panics
+    ///
+    /// Panics if the starting point is greater than the end point or if
+    /// the end point is greater than the length of the vector.
+    ///
+    /// # Examples
     ///
     /// ```
     /// let mut vec = vec![0, 1, 2, 3, 4];