diff --git a/docs/user-manual/modules/ROOT/pages/aggregate-eip.adoc b/docs/user-manual/modules/ROOT/pages/aggregate-eip.adoc
index 3693493..1d12138 100644
@@ -66,6 +66,10 @@ use.
Notice the aggregation strategy is a mandatory option and must be
provided to the aggregator.
+IMPORTANT: In the aggregate method, do not create a new exchange instance to return,
+instead return either the old or new exchange from the input parameters;
+favor returning the old exchange whenever possible.
Here are a few example `AggregationStrategy` implementations that should
help you create your own custom strategy.