diff --git a/fsl/data/mesh.py b/fsl/data/mesh.py
index bb2d9b2377ad25dec43614387d0383eabf086100..395c78e4541e6f3140c1d830feb506b7bf9f3af9 100644
--- a/fsl/data/mesh.py
+++ b/fsl/data/mesh.py
@@ -698,7 +698,7 @@ def needsFixing(vertices, indices, fnormals, loBounds, hiBounds):
 
 
 class TriangleMesh(Mesh):
-    """Deprecated - use :class:`fsl.data.mesh.Mesh`, or one 'of its sub-classes
+    """Deprecated - use :class:`fsl.data.mesh.Mesh`, or one of its sub-classes
     instead.
     """
 
@@ -783,3 +783,13 @@ def findReferenceImage(*args, **kwargs):
     """Deprecated - use :func:`fsl.data.vtk.findReferenceImage` instead. """
     import fsl.data.vtk as fslvtk
     return fslvtk.findReferenceImage(*args, **kwargs)
+
+
+ALLOWED_EXTENSIONS = ['.vtk']
+"""Deprecated, will be removed in fslpy 2.0.0. Use
+:attr:`fsl.data.vtk.ALLOWED_EXTENSIONS` instead."""
+
+
+EXTENSION_DESCRIPTIONS = ['VTK polygon model file']
+"""Deprecated, will be removed in fslpy 2.0.0. Use
+:attr:`fsl.data.vtk.EXTENSION_DESCRIPTIONS` instead."""
diff --git a/fsl/data/vtk.py b/fsl/data/vtk.py
index e34d4146dd0d1fe9828783782f9524ec89964596..24835e7a3099ea54979d1f6c63cb7157b3e2bf51 100644
--- a/fsl/data/vtk.py
+++ b/fsl/data/vtk.py
@@ -7,6 +7,15 @@
 """This module provides the :class:`VTKMesh` class, for loading triangle
 meshes from VTK files.
 
+A handful of convenience functions are also in this module:
+
+.. autosummary::
+   :nosignatures:
+
+   loadVTKPolyDataFile
+   getFIRSTPrefix
+   findReferenceImage
+
 
 .. note:: I/O support is very limited - currently, the only supported file
           type is the VTK legacy file format, containing the ``POLYDATA``