diff --git a/README/ReleaseNotes/v622/index.md b/README/ReleaseNotes/v622/index.md
index 12d42ba60a20b01ff3a9ce3c5aa91a84323f6e74..821e8110c402a63984e0512ea8de4ba41ef9b38c 100644
--- a/README/ReleaseNotes/v622/index.md
+++ b/README/ReleaseNotes/v622/index.md
@@ -48,6 +48,11 @@ The following people have contributed to this new version:
 
 ## TTree Libraries
 
+- A new status bit was added to `TTree`: `kEntriesReshuffled`, which indicates a `TTree` that is the output of the
+  processing of another tree during which its entry order has been changed (this can happen, for instance, when
+  processing a tree in a multi-thread application). To avoid silent entry number mismatches, trees with this bit set
+  cannot add friend trees nor can be added as friends, unless the friend `TTree` has an appropriate `TTreeIndex`.
+
 
 ## Histogram Libraries