diff --git a/boxtree/tree_build_kernels.py b/boxtree/tree_build_kernels.py
index b24c3b7ce3371639c8afd76c604c13fdeb5ac0ec..5a8dbc2d0a49186a89869a826079589b4b3d2f13 100644
--- a/boxtree/tree_build_kernels.py
+++ b/boxtree/tree_build_kernels.py
@@ -100,7 +100,7 @@ logger = logging.getLogger(__name__)
 #    boxes.
 #
 # 3. Realize the splitting determined in #2. This stage proceeds in an
-#    element-wise fashion over the boxes at the current level.
+#    element-wise fashion over the particles.
 #
 # -----------------------------------------------------------------------------