1 files changed, 5 insertions, 1 deletions
diff --git a/cmd/sl.go b/cmd/sl.go
index cabd4ce..6a6af63 100644
--- a/cmd/sl.go
+++ b/cmd/sl.go
@@ -42,7 +42,11 @@ func runSLSearch(cmd *cobra.Command, args []string) error {
 		Query: args[0],
 	}
 	params.MaxHits, _ = cmd.Flags().GetInt("max_hits")
-	params.SortBy, _ = cmd.Flags().GetString("sort_by")
+	sortBy, _ := cmd.Flags().GetString("sort_by")
+	if sortBy != "" && sortBy != "ingest_timestamp" && sortBy != "date_posted" {
+		return fmt.Errorf("invalid sort_by value: must be 'ingest_timestamp' or 'date_posted'")
+	}
+	params.SortBy = sortBy
 	params.IngestStartDate, _ = cmd.Flags().GetString("ingest_start_date")
 	params.IngestEndDate, _ = cmd.Flags().GetString("ingest_end_date")
 	params.PostedStartDate, _ = cmd.Flags().GetString("posted_start_date")