diff --git a/src/libcollections/str.rs b/src/libcollections/str.rs
index 6be46855fe60..7e72ad1569a1 100644
--- a/src/libcollections/str.rs
+++ b/src/libcollections/str.rs
@@ -483,9 +483,7 @@ impl str {
     /// considered to be
     /// boundaries.
     ///
-    /// # Panics
-    ///
-    /// Panics if `index` is greater than `self.len()`.
+    /// Returns `false` if `index` is greater than `self.len()`.
     ///
     /// # Examples
     ///