diff --git a/docs/source/pythonapi/base.rst b/docs/source/pythonapi/base.rst
index 2c0ac8797..e7d139938 100644
--- a/docs/source/pythonapi/base.rst
+++ b/docs/source/pythonapi/base.rst
@@ -107,6 +107,7 @@ Constructing Tallies
    openmc.CellFilter
    openmc.CellFromFilter
    openmc.CellbornFilter
+   openmc.CellInstanceFilter
    openmc.SurfaceFilter
    openmc.MeshFilter
    openmc.MeshSurfaceFilter