diff --git a/src/spikeinterface/extractors/neoextractors/openephys.py b/src/spikeinterface/extractors/neoextractors/openephys.py
index 24bc7591e4..dd24e6cae7 100644
--- a/src/spikeinterface/extractors/neoextractors/openephys.py
+++ b/src/spikeinterface/extractors/neoextractors/openephys.py
@@ -250,6 +250,7 @@ def __init__(
                 except:
                     warnings.warn(f"Could not load synchronized timestamps for {stream_name}")
 
+        self.annotate(experiment_name=f"experiment{exp_id}")
         self._stream_folders = stream_folders
 
         self._kwargs.update(