diff --git a/docs/source/masking/index.rst b/docs/source/masking/index.rst
index 5238dc8..0e941a7 100644
--- a/docs/source/masking/index.rst
+++ b/docs/source/masking/index.rst
@@ -156,7 +156,7 @@ the desired particles include some that are not identified as members by the hal
 a modified approach is needed. For example, let's suppose that you want to select *all*
 simulation particles within a 1 Mpc aperture of a galaxy's centre, regardless of their
 membership status according to the halo catalogue. For illustration we'll take a galaxy
-picked from a :class:`~swiftgalaxy.halo_finders.SOAP` catalogue. The first step is to
+picked from a :class:`~swiftgalaxy.halo_catalogues.SOAP` catalogue. The first step is to
 override the default ``extra_mask="bound_only"`` behaviour with ``extra_mask=None``. We
 also need to override the default spatial selection from the simulation, because the 1 Mpc
 spherical region of interest might extend beyond the region occupied by member particles
diff --git a/swiftgalaxy/reader.py b/swiftgalaxy/reader.py
index cf90e9c..75223ba 100644
--- a/swiftgalaxy/reader.py
+++ b/swiftgalaxy/reader.py
@@ -71,16 +71,16 @@ def _apply_box_wrap(
     :class:`~swiftsimio.objects.cosmo_array`
         The coordinates wrapped to lie within the box dimensions.
     """
-    rotation_is_identity = (
+    _rotation_is_identity = (
         True
         if current_transform is None
         else current_transform.rotation.approx_equal(Rotation.identity())
     )
     # in scipy 1.16 approx_equal returns bool, in 1.17 returns array of bool, so:
     rotation_is_identity = (
-        rotation_is_identity.all()
-        if hasattr(rotation_is_identity, "all")
-        else rotation_is_identity
+        _rotation_is_identity.all()
+        if hasattr(_rotation_is_identity, "all")
+        else _rotation_is_identity
     )
     if boxsize is None:
         return coords
@@ -1690,8 +1690,8 @@ def _copyinit(
         coordinate_frame_from: Optional["SWIFTGalaxy"] = None,
         _spatial_mask: Optional[SWIFTMask] = None,
         _extra_mask: Optional[MaskCollection] = None,
-        _coordinate_like_transform: Optional[np.ndarray] = None,
-        _velocity_like_transform: Optional[np.ndarray] = None,
+        _coordinate_like_transform: Optional[RigidTransform] = None,
+        _velocity_like_transform: Optional[RigidTransform] = None,
         _data_server: Optional["SWIFTGalaxy"] = None,
     ) -> "SWIFTGalaxy":
         """