diff --git a/camtools/__init__.py b/camtools/__init__.py
index 39ec1a4..a504a83 100644
--- a/camtools/__init__.py
+++ b/camtools/__init__.py
@@ -39,6 +39,7 @@ def _get_package_version(package):
 
 
 # Check open3d and numpy compatibility
+# https://github.com/isl-org/Open3D/issues/6840
 try:
     logging.basicConfig(format="%(message)s")
     _logger = logging.getLogger(__name__)