diff --git a/docs/source_docs/user_guide/inputs/geometry.rst b/docs/source_docs/user_guide/inputs/geometry.rst
index a1839c8100113a177b933ac4186227433f1dbda4..bc4f7ccb557843f65e110447e50e446476036cd7 100644
--- a/docs/source_docs/user_guide/inputs/geometry.rst
+++ b/docs/source_docs/user_guide/inputs/geometry.rst
@@ -8,7 +8,7 @@ The following inputs are defined using the prefix ``mfix``:
 +------------------------+-------------------------------------------------------------------------------+----------+---------------------+
 |                        | Description                                                                   |   Type   | Default             |
 +========================+===============================================================================+==========+=====================+
-| geometry               | Simulation geometry type.                                                     |   String | ''                  |
+| geometry               | Simulation geometry type.                                                     |   String | 'box'               |
 |                        | Options (case-insensitive):                                                   |          |                     |
 |                        |                                                                               |          |                     |
 |                        | * ``box`` - predefined :ref:`box geometry<InputsGeometry_box>`                |          |                     |
@@ -16,10 +16,7 @@ The following inputs are defined using the prefix ``mfix``:
 |                        | * ``generic`` - :ref:`user-defined geometry<InputsGeometry_generic>`          |          |                     |
 |                        | * ``CSG`` - use :ref:`Constructive Solid Geometry<InputsGeometry_CSG>` file   |          |                     |
 |                        | * ``STL`` - use :ref:`Standard Triangle Language<InputsGeometry_STL>` file    |          |                     |
-|                        |                                                                               |          |                     |
-|                        | If left undefined, then the system should be fully periodic, or               |          |                     |
-|                        | :ref:`planar regions<InputsGeometry_Regions_and_BCs>` should be used to       |          |                     |
-|                        | enclose the domain.                                                           |          |                     |
+|                        | * ``None`` - no embedded boundary -- all domain faces must be specified       |          |                     |
 |                        |                                                                               |          |                     |
 +------------------------+-------------------------------------------------------------------------------+----------+---------------------+
 | levelset__refinement   | Refinement factor of levelset resolution relative to level 0                  |   Int    | 1                   |