diff --git a/src/device/service/drivers/openconfig/OpenConfigDriver.py b/src/device/service/drivers/openconfig/OpenConfigDriver.py
index a541a23bf61cc3b263bd7fc519d2d5aafa930e61..923cd887603735c5c011187522e178631e909aab 100644
--- a/src/device/service/drivers/openconfig/OpenConfigDriver.py
+++ b/src/device/service/drivers/openconfig/OpenConfigDriver.py
@@ -131,6 +131,7 @@ def do_sampling(samples_cache : SamplesCache, resource_key : str, out_samples :
         if value is None:
             LOGGER.warning('[do_sampling] value not found for {:s}'.format(resource_key))
             return
+        # resource_key template: //oci:interfaces/oci:interface[oci:name='{:s}']/state/counters/{:s}
         sample = (timestamp, resource_key, value)
         out_samples.put_nowait(sample)
     except: # pylint: disable=bare-except