diff --git a/docs/stream-aggregation.md b/docs/stream-aggregation.md
index 161d6011f..6882cb401 100644
--- a/docs/stream-aggregation.md
+++ b/docs/stream-aggregation.md
@@ -451,6 +451,12 @@ For example, see below time series produced by config with aggregation interval
 Aggregating irregular and sporadic metrics (received from [Lambdas](https://aws.amazon.com/lambda/)
 or [Cloud Functions](https://cloud.google.com/functions)) can be controlled via [staleness_inteval](#stream-aggregation-config).
 
+`increase` can be used as an alternative for [rate](https://docs.victoriametrics.com/MetricsQL.html#rate) function.
+For example, if we have `increase` with `interval` of `5m` for a counter `some_counter`, then to get `rate` we should divide
+the resulting aggregation by the `interval` in seconds: `some_counter:5m_increase / 300` is similar to `rate(some_counter[5m])`.
+Please note, opposite to [rate](https://docs.victoriametrics.com/MetricsQL.html#rate), `increase` aggregations can be 
+combined safely afterwards. This is helpful when the aggregation is calculated by more than one vmagent.
+
 ### count_series
 
 `count_series` counts the number of unique [time series](https://docs.victoriametrics.com/keyConcepts.html#time-series).