diff --git a/docs/source/io_formats/geometry.rst b/docs/source/io_formats/geometry.rst
index 6d0a37a24f..2947502196 100644
--- a/docs/source/io_formats/geometry.rst
+++ b/docs/source/io_formats/geometry.rst
@@ -219,6 +219,30 @@ Each ``<cell>`` element can have the following attributes or sub-elements:
 
     *Default*: None
 
+  :triso_particle:
+    If the cell is filled with a TRISO particle,  use this element to mark it.
+
+    .. note:: Only cells with spherical area can be marked.
+
+    *Default*: false
+
+  :virtual_lattice:
+    If the cell is filled with a matrix containing the TRISO particle,  use this
+    element to mark it. This can accelerate the search speed of neutrons in the 
+    region containing a large number of TRISO particles.
+
+    *Default*: false
+  
+  :shape:
+    If the virtual_lattice is True. This element specifies the shape of the
+    lattice.
+
+    .. note:: The shape of the lattice must be specified if the virtual_lattice
+              is True. Related methods can be referred to Liang, J., Li, R., Liu, Z., 
+              2024. Virtual lattice method for efficient Monte Carlo transport simulation
+              of dispersion nuclear fuels. Computer Physics Communications 295, 108985. 
+              https://doi.org/10.1016/j.cpc.2023.108985
+
 
 ---------------------
 ``<lattice>`` Element
diff --git a/openmc/model/triso.py b/openmc/model/triso.py
index 0a54880bfa..ac70044491 100644
--- a/openmc/model/triso.py
+++ b/openmc/model/triso.py
@@ -819,6 +819,11 @@ def create_triso_lattice(trisos, lower_left, pitch, shape, background, virtual=F
     background : openmc.Material
         A background material that is used anywhere within the lattice but
         outside a TRISO particle
+    virtual : bool
+        If True, create a virtual lattice where each cell is repeated
+        according to the pitch and shape. This is useful for creating a
+        lattice with a very large number of elements.
+        Default is False.
 
     Returns
     -------