Update replication-performance.html.md

website/source/api/system/replication-performance.html.md

@@ -392,7 +392,8 @@ primary at a time.
   not directly accessible and must be accessed via an alternate path/address
   (e.g. through a load balancer).
 - `force` `(bool: false)` - If true the cluster will be promoted even if it fails 
-  certain safety checks.
+  certain safety checks. Caution: Forcing promotion could result in data loss if 
+  data isn't fully replicated.
 
 ### Sample Payload