diff --git a/docs/stream-aggregation.md b/docs/stream-aggregation.md
index b277f1003e..3a83206cba 100644
--- a/docs/stream-aggregation.md
+++ b/docs/stream-aggregation.md
@@ -65,6 +65,9 @@ Stream aggregation can be used as [statsd](https://github.com/statsd/statsd) alt
 * [Quantiles over input metrics](#quantiles-over-input-metrics)
 * [Histograms over input metrics](#histograms-over-input-metrics)
 
+Currently, streamin aggregation is available only for [supported data ingestion protocols](https://docs.victoriametrics.com/#how-to-import-time-series-data)
+and not available for [Statsd metrics format](https://github.com/statsd/statsd/blob/master/docs/metric_types.md).
+
 ### Recording rules alternative
 
 Sometimes [alerting queries](https://docs.victoriametrics.com/vmalert.html#alerting-rules) may require non-trivial amounts of CPU, RAM,