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--- a/src/CelerisLab/lbm/refinement_stepper.py
+++ b/src/CelerisLab/lbm/refinement_stepper.py
@@ -32,6 +32,7 @@
``coarse_boundary`` is ``periodic`` (default) or ``slot_reservoir``:
a bottom on-site slot and top fixed-density reservoir from ``cfg``.
+ Periodic mode does not apply the wall/slot boundary fields in ``cfg``.
Physical walls remain coarse; fine halo donors must be ordinary fluid.
``initialize(coarse_g, fine_g)`` accepts physical Q-major (9,ny,nx) arrays