diff --git a/src/hdf5plugin/_filters.py b/src/hdf5plugin/_filters.py
index 39885b7e..63a269a1 100644
--- a/src/hdf5plugin/_filters.py
+++ b/src/hdf5plugin/_filters.py
@@ -587,6 +587,11 @@ class SZ3(_FilterRefClass):
**hdf5plugin.SZ3(absolute=0.1))
For more details about the compressor, see `SZ3 `_.
+
+ .. warning::
+
+ Backward compatibility is currently not guaranteed:
+ See `this discussion `_.
"""
filter_name = "sz3"
filter_id = SZ3_ID