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diff --git a/manpages/taler-exchange-aggregator.1.rst b/manpages/taler-exchange-aggregator.1.rst
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@@ -27,6 +27,10 @@ Description
to the same merchant into larger wire transfers. The actual transfers are then
done by **taler-exchange-transfer**.
+The AGGREGATOR_SHARD_SIZE option can be used to allow multiple aggregator processes to run in parallel and share the load. This is only recommended if a single aggregator is insufficient for the workload.
+The aggregator uses a special table to lock shards it is working on. If an aggregator process dies (say due to a power failure), these shard locks may prevent the aggregator from resuming normally. In this case, you must run "taler-exchange-dbinit -s" to release the shard locks before restarting the aggregator.
**-c** *FILENAME* \| **--config=**\ \ *FILENAME*
Use the configuration and other resources for the exchange to operate