diff --git a/docs/source_docs/eb/EBWalls.rst b/docs/source_docs/eb/EBWalls.rst
index cd1675ece2e1cd926766bbc2d0294a6a1cf10b55..7fe3b81e939c57f6624fbe0d971a9552911c7469 100644
--- a/docs/source_docs/eb/EBWalls.rst
+++ b/docs/source_docs/eb/EBWalls.rst
@@ -11,11 +11,12 @@
 Constructing Embedded Boundaries in MFIX-Exa
 ============================================
 
-MFIX-Exa allows 3 approaches to specify embedded boundaries (EBs).
+MFIX-Exa allows 4 approaches to specify embedded boundaries (EBs).
 
 1. Using native AMReX cpp functions.
 2. Using CSG file format.
 3. Using planar walls.
+4. Using STL file format.
 
 There are also two parameters (specified in the ``inputs`` file) that influence
 the level-set creation:
@@ -72,8 +73,9 @@ CSG File Format
 Alternatively, the constructive solid geometry can be created using
 OpenSCAD's CSG file format by installing the ``csg-eb`` library.
 To use this option, MFIX-Exa must be built with the flag ``MFIX_CSG=TRUE``
-and the option ``mfix.geometry_filename`` must be set in the ``inputs``.
-See the `CSG-EB repository`_  for more details about this format.
+and the options ``mfix.geom_type = csg`` and ``mfix.geometry_filename``
+must be set in the ``inputs``. See the `CSG-EB repository`_  for more
+details about this format.
 
 
 Planar Walls
@@ -85,6 +87,15 @@ file. Even if the user does not specify an ``mfix.geometry`` or
 any no-slip or free-slip boundary conditions are expressed as EB walls.
 
 
+STL File Format
+***************
+
+A standard triangle language (STL) file created using numerous
+CAD programs can also specify the EB geometry. To use this method,
+the options ``mfix.geom_type = stl`` and ``mfix.geometry_filename``
+must be set in the ``inputs``.
+
+
 How MFIX-Exa Constructs the EB Geometry
 ---------------------------------------