diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt
index 9dd661e6a7..78eb175329 100644
--- a/docs/ref/models/querysets.txt
+++ b/docs/ref/models/querysets.txt
@@ -2126,6 +2126,7 @@ them, but it has a few caveats:
   ``batch_size``.
 * Updating fields defined on multi-table inheritance ancestors will incur an
   extra query per ancestor.
+* If ``objs`` contains duplicates, only the first one is updated.
 
 The ``batch_size`` parameter controls how many objects are saved in a single
 query. The default is to create all objects in one batch, except for SQLite