Update configure-placement-rules.md (#2875)

Co-authored-by: Keke Yi <40977455+yikeke@users.noreply.github.com>
pingcap · Jun 16, 2020 · e2b303f · e2b303f
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diff --git a/configure-placement-rules.md b/configure-placement-rules.md
@@ -90,6 +90,10 @@ pd-ctl config placement-rules enable
 
 PD also generates default rules based on the `max-replicas` and `location-labels` configurations.
 
+> **Note:**
+>
+> After enabling Placement Rules, the previously configured `max-replicas` and `location-labels` no longer take effect. To adjust the replica policy, use the interface related to Placement Rules.
+
 ### Disable Placement Rules
 
 You can use pd-ctl to disable the Placement Rules feature and switch to the previous scheduling strategy.