diff --git a/README.md b/README.md
index 912b423fb..a0f89bdc1 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,8 @@ in [source code](https://github.com/VictoriaMetrics/VictoriaMetrics). Just downl
 
 Cluster version is available [here](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/cluster).
 
+See our [Wiki](https://github.com/VictoriaMetrics/VictoriaMetrics/wiki) for additional documentation.
+
 [Contact us](mailto:info@victoriametrics.com) if you need paid enterprise support for VictoriaMetrics.
 
 
@@ -820,6 +822,8 @@ Data is split in per-month subdirectories inside `<-storageDataPath>/data/small`
 Directories for months outside the configured retention are deleted on the first day of new month.
 In order to keep data according to `-retentionPeriod` max disk space usage is going to be `-retentionPeriod` + 1 month.
 For example if `-retentionPeriod` is set to 1, data for January is deleted on March 1st.
+It is safe to extend `-retentionPeriod` on existing data. If `-retentionPeriod` is set to lower
+value than before then data outside the configured period will be eventually deleted.
 
 ### Multiple retentions