diff --git a/configs/resident/trip_destination_annotate_trips_preprocessor.csv b/configs/resident/trip_destination_annotate_trips_preprocessor.csv
index b71ee58..b1af3c1 100644
--- a/configs/resident/trip_destination_annotate_trips_preprocessor.csv
+++ b/configs/resident/trip_destination_annotate_trips_preprocessor.csv
@@ -36,4 +36,5 @@ adding _trips to avoid conflict with the variables in the tours_merged,age_trips
 Micromobility access Time,o_MicroAccessTime,"reindex(land_use.MicroAccessTime,df.origin)"
 ,max_walk_distance,max_walk_distance
 ,max_bike_distance,max_bike_distance
-,microAccessThreshold,microAccessThreshold
\ No newline at end of file
+,microAccessThreshold,microAccessThreshold
+,purpose_index_num,"size_terms.get_cols(df.purpose)"
\ No newline at end of file