Fixed command typo

docs/SOP_alignment_variant_annotation.md

@@ -218,7 +218,7 @@ perl $SCRIPTS/trio_whole_exome_parse_peddy_ped_csv.pl \
   --project $short_project_id \
   --batch $batch_id \
   --version $version \
-  --ped ../params/$project_id.ped
+  --ped ../params/$project_id.ped \
   --families .
 grep -v False$ ../qc/${short_project_id}_${version}.ped_check.txt
 ```