diff --git a/app/vmalert/README.md b/app/vmalert/README.md
index 52e2a6d0f1..3b65798e7b 100644
--- a/app/vmalert/README.md
+++ b/app/vmalert/README.md
@@ -390,6 +390,10 @@ Alertmanagers.
 To avoid recording rules results and alerts state duplication in VictoriaMetrics server
 don't forget to configure [deduplication](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#deduplication).
 The recommended value for `-dedup.minScrapeInterval` must be greater or equal to vmalert's `evaluation_interval`.
+If you observe inconsistent or "jumping" values in series produced by vmalert, try disabling `-datasource.queryTimeAlignment`
+command line flag. Because of alignment, two or more vmalert HA pairs will produce results with the same timestamps. 
+But due of backfilling (data delivered to the datasource with some delay) values of such results may differ, 
+which would affect deduplication logic and result into "jumping" datapoints.
 
 Alertmanager will automatically deduplicate alerts with identical labels, so ensure that
 all `vmalert`s are having the same config.
diff --git a/docs/vmalert.md b/docs/vmalert.md
index 75166636d6..e11cb61b76 100644
--- a/docs/vmalert.md
+++ b/docs/vmalert.md
@@ -394,6 +394,10 @@ Alertmanagers.
 To avoid recording rules results and alerts state duplication in VictoriaMetrics server
 don't forget to configure [deduplication](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#deduplication).
 The recommended value for `-dedup.minScrapeInterval` must be greater or equal to vmalert's `evaluation_interval`.
+If you observe inconsistent or "jumping" values in series produced by vmalert, try disabling `-datasource.queryTimeAlignment`
+command line flag. Because of alignment, two or more vmalert HA pairs will produce results with the same timestamps. 
+But due of backfilling (data delivered to the datasource with some delay) values of such results may differ, 
+which would affect deduplication logic and result into "jumping" datapoints.
 
 Alertmanager will automatically deduplicate alerts with identical labels, so ensure that
 all `vmalert`s are having the same config.