-consume more memory. Care should be taken to ensure that multiple
-instances of C<rt-fulltext-indexer> are not run at the same time.
+consume more memory.
+
+If there is already an instances of C<rt-fulltext-indexer> running, new
+ones will exit abnormally (with exit code 1) and the error message
+"rt-fulltext-indexer is already running." You can suppress this message
+and end those processes normally (with exit code 0) using the C<--quiet>
+option; this is particularly useful when running the command via
+C<cron>:
+
+ sbin/rt-fulltext-indexer --quiet