diff --git a/src/calibre/utils/formatter_functions.py b/src/calibre/utils/formatter_functions.py
index 4455d4d9eb..008fd4187a 100644
--- a/src/calibre/utils/formatter_functions.py
+++ b/src/calibre/utils/formatter_functions.py
@@ -1982,7 +1982,9 @@ r'''
 items in ``list1`` and ``list2``[/], removing duplicate items using a case-insensitive
 comparison. If items differ in case, the one in ``list1`` is used.
 The items in ``list1`` and ``list2`` are separated by ``separator``, as are the
-items in the returned list. Aliases: ``merge_lists()``, ``list_union()``
+items in the returned list.
+
+Aliases: ``merge_lists()``, ``list_union()``
 ''')
     aliases = ['merge_lists']