From c7facedf10d720989d22379ce19cc6d7d00ac4e9 Mon Sep 17 00:00:00 2001
From: filimonov <1549571+filimonov@users.noreply.github.com>
Date: Wed, 4 Nov 2020 12:02:30 +0100
Subject: [PATCH] Update clickhouse-copier.md

---
 docs/en/operations/utilities/clickhouse-copier.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docs/en/operations/utilities/clickhouse-copier.md b/docs/en/operations/utilities/clickhouse-copier.md
index d450f5753e4..ec5a619b86b 100644
--- a/docs/en/operations/utilities/clickhouse-copier.md
+++ b/docs/en/operations/utilities/clickhouse-copier.md
@@ -7,6 +7,9 @@ toc_title: clickhouse-copier
 
 Copies data from the tables in one cluster to tables in another (or the same) cluster.
 
+!!! warning "Warning"
+    To get a consistent copy, the data in the source tables and partitions should not change during the entire process.
+
 You can run multiple `clickhouse-copier` instances on different servers to perform the same job. ZooKeeper is used for syncing the processes.
 
 After starting, `clickhouse-copier`: