diff --git a/openmc/mesh.py b/openmc/mesh.py
index 94bcf947b0..f8e1bc6b22 100644
--- a/openmc/mesh.py
+++ b/openmc/mesh.py
@@ -590,7 +590,7 @@ class RectilinearMesh(MeshBase):
         return element
 
 class UnstructuredMesh(MeshBase):
-    """An unstructured mesh, assumed to be three dimensionality
+    """A 3D unstructured mesh
 
     Parameters
     ----------