diff --git a/src/spec/create_extension_spec.py b/src/spec/create_extension_spec.py
index 32a5f60..1830422 100644
--- a/src/spec/create_extension_spec.py
+++ b/src/spec/create_extension_spec.py
@@ -125,6 +125,19 @@ def main():
                 doc="Optional column containing the duration of each event, in seconds.",
                 quantity="?",
             ),
+            NWBDatasetSpec(
+                name="value",
+                neurodata_type_inc="VectorData",
+                doc=(
+                    "Optional column containing a value/parameter associated with each event. "
+                    "For example, if you have three levels of reward (e.g., 1 drop, 2 drops, "
+                    "3 drops), instead of encoding each level of reward as its own event "
+                    "type (e.g., 'reward_value_1', 'reward_value_2', 'reward_value_3', "
+                    "you could encode 'reward' as the event type, and the value for each "
+                    "event time could be 1, 2, or 3."
+                ),
+                quantity="?",
+            ),
         ],
     )