diff --git a/src/neuroconv/tools/roiextractors/imagingextractordatachunkiterator.py b/src/neuroconv/tools/roiextractors/imagingextractordatachunkiterator.py
index 0792e2caf..506967be0 100644
--- a/src/neuroconv/tools/roiextractors/imagingextractordatachunkiterator.py
+++ b/src/neuroconv/tools/roiextractors/imagingextractordatachunkiterator.py
@@ -44,8 +44,8 @@ def __init__(
             The upper bound on size in megabytes (MB) of the internal chunk for the HDF5 dataset.
             The chunk_shape will be set implicitly by this argument.
             Cannot be set if `chunk_shape` is also specified.
-            The default is 10MB. For more details, see
-            https://support.hdfgroup.org/HDF5/doc/TechNotes/TechNote-HDF5-ImprovingIOPerformanceCompressedDatasets.pdf
+            The default is 10MB, as recommended by the HDF5 group.
+            For more details, search the hdf5 documentation for "Improving IO Performance Compressed Datasets".
         chunk_shape : tuple, optional
             Manual specification of the internal chunk shape for the HDF5 dataset.
             Cannot be set if `chunk_mb` is also specified.
diff --git a/src/neuroconv/tools/spikeinterface/spikeinterfacerecordingdatachunkiterator.py b/src/neuroconv/tools/spikeinterface/spikeinterfacerecordingdatachunkiterator.py
index 95b14fc23..5d6407f19 100644
--- a/src/neuroconv/tools/spikeinterface/spikeinterfacerecordingdatachunkiterator.py
+++ b/src/neuroconv/tools/spikeinterface/spikeinterfacerecordingdatachunkiterator.py
@@ -48,8 +48,8 @@ def __init__(
             The upper bound on size in megabytes (MB) of the internal chunk for the HDF5 dataset.
             The chunk_shape will be set implicitly by this argument.
             Cannot be set if `chunk_shape` is also specified.
-            The default is 1MB, as recommended by the HDF5 group. For more details, see
-            https://support.hdfgroup.org/HDF5/doc/TechNotes/TechNote-HDF5-ImprovingIOPerformanceCompressedDatasets.pdf
+            The default is 10MB, as recommended by the HDF5 group.
+            For more details, search the hdf5 documentation for "Improving IO Performance Compressed Datasets".
         chunk_shape : tuple, optional
             Manual specification of the internal chunk shape for the HDF5 dataset.
             Cannot be set if `chunk_mb` is also specified.