examples/grok-pull.post_update_hook.sh | 4 +++-

diff --git a/examples/grok-pull.post_update_hook.sh b/examples/grok-pull.post_update_hook.sh
index 092ca283b30e289165cf86d279d22fb8a0ac1dbe..1f51140ffbd139b57d41065e619a4115173ee841 100755
--- a/examples/grok-pull.post_update_hook.sh
+++ b/examples/grok-pull.post_update_hook.sh
@@ -124,7 +124,9 @@ 	0|'')
 		: v2 inboxes may be init-ed with an empty msgmap
 		;;
 	*)
-		# if on HDD and limited RAM, add `-j0' w/ public-inbox 1.6.0+
+		# if on HDD and limited RAM, add `--sequential-shard'
+		# and possibly a large `--batch-size' if you have much
+		# memory in public-inbox 1.6.0+
 		$EATMYDATA public-inbox-index -v "$inbox_dir"
 		;;
 	esac