diff --git a/boxtree/traversal.py b/boxtree/traversal.py
index a35c60d08cfcc9850b49f50fd7fd4b561c1019d4..44d40e9a6361d22a40237516b8bbb549654aa484 100644
--- a/boxtree/traversal.py
+++ b/boxtree/traversal.py
@@ -1294,7 +1294,7 @@ class FMMTraversalInfo(DeviceDataRecord):
 
     .. attribute:: from_sep_close_smaller_starts
 
-        ``box_id_t [ntargets+1]`` (or *None*)
+        ``box_id_t [ntarget_boxes+1]`` (or *None*)
 
     .. attribute:: from_sep_close_smaller_lists