diff --git a/convert-to-parquet/run-convert-to-parquet.sh b/convert-to-parquet/run-convert-to-parquet.sh
index 4055d10662d16944db6e166409d420363d2e90ab..7ce57af5a8c05b2e00ad87740cdd347e89434217 100755
--- a/convert-to-parquet/run-convert-to-parquet.sh
+++ b/convert-to-parquet/run-convert-to-parquet.sh
@@ -20,7 +20,7 @@ default_sif_image="daskdev/dask:2024.8.0-py3.12"
 usage()
 {
 >&2 cat << EOF
-Usage: $0 [ -h ] [ -o | --outdir ] [ -n | --ntasks ] [ -p | --partition] [ -t | --time ] [ -m | --mem ] <gpfs_logdir>"
+Usage: $0 [ -h ] [ -s | --sif ] [ -o | --outdir ] [ -n | --ntasks ] [ -p | --partition] [ -t | --time ] [ -m | --mem ] <gpfs_logdir>"
 EOF
 exit 1
 }