explicitly specify insertion-order feature in docs

1 files changed, 1 insertions, 1 deletions

diff --git a/src/library/scala/collection/immutable/ListMap.scala b/src/library/scala/collection/immutable/ListMap.scala
index 7c40e84280..1eedf93269 100644
--- a/src/library/scala/collection/immutable/ListMap.scala
+++ b/src/library/scala/collection/immutable/ListMap.scala
@@ -32,7 +32,7 @@ object ListMap extends ImmutableMapFactory[ListMap] {
   private object EmptyListMap extends ListMap[Any, Nothing] { }
 }
 
-/** This class implements immutable maps using a list-based data structure.
+/** This class implements immutable maps using a list-based data structure, which preserves insertion order.
  *  Instances of `ListMap` represent empty maps; they can be either created by
  *  calling the constructor directly, or by applying the function `ListMap.empty`.
  *