3 files changed, 6 insertions, 6 deletions
diff --git a/src/liballoc/collections/vec_deque.rs b/src/liballoc/collections/vec_deque.rs
index d65c24f7350..82a60f92444 100644
--- a/src/liballoc/collections/vec_deque.rs
+++ b/src/liballoc/collections/vec_deque.rs
@@ -1835,8 +1835,8 @@ impl<T> VecDeque<T> {
     /// Retains only the elements specified by the predicate.
     ///
     /// In other words, remove all elements `e` such that `f(&e)` returns false.
-    /// This method operates in place and preserves the order of the retained
-    /// elements.
+    /// This method operates in place, visiting each element exactly once in the
+    /// original order, and preserves the order of the retained elements.
     ///
     /// # Examples
     ///
diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
index a3e2098695f..aaa38142693 100644
--- a/src/liballoc/string.rs
+++ b/src/liballoc/string.rs
@@ -1200,8 +1200,8 @@ impl String {
     /// Retains only the characters specified by the predicate.
     ///
     /// In other words, remove all characters `c` such that `f(c)` returns `false`.
-    /// This method operates in place and preserves the order of the retained
-    /// characters.
+    /// This method operates in place, visiting each character exactly once in the
+    /// original order, and preserves the order of the retained characters.
     ///
     /// # Examples
     ///
diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index cd62c3e0524..a9bc835010f 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -937,8 +937,8 @@ impl<T> Vec<T> {
     /// Retains only the elements specified by the predicate.
     ///
     /// In other words, remove all elements `e` such that `f(&e)` returns `false`.
-    /// This method operates in place and preserves the order of the retained
-    /// elements.
+    /// This method operates in place, visiting each element exactly once in the
+    /// original order, and preserves the order of the retained elements.
     ///
     /// # Examples
     ///