diff --git a/check-before-deployment.md b/check-before-deployment.md
index 2a9e3eaffcaeb..41292e91f0bfc 100644
--- a/check-before-deployment.md
+++ b/check-before-deployment.md
@@ -781,3 +781,7 @@ sudo yum -y install numactl
     ```
 
     To get help information of the `tiup cluster exec` command, run the `tiup cluster exec --help` command.
+
+## Disable SELinux
+
+Use the [getenforce(8)](https://linux.die.net/man/8/getenforce) utility to check if SELinux is disabled or set to permissive. SELinux in enforcing mode can cause deployment failures. For instructions on disabling SELinux, refer to your operating system's documentation.
diff --git a/dm/quick-start-with-dm.md b/dm/quick-start-with-dm.md
index 3386f01ffa96f..b9df1b32dd750 100644
--- a/dm/quick-start-with-dm.md
+++ b/dm/quick-start-with-dm.md
@@ -8,6 +8,10 @@ aliases: ['/docs/tidb-data-migration/dev/get-started/']
 
 This document describes how to migrate data from MySQL to TiDB using [TiDB Data Migration (DM)](/dm/dm-overview.md). This guide is a quick demo of DM features and is not recommended for any production environment.
 
+> **Note:**
+>
+> If your target machine's operating system supports SELinux, ensure that SELinux is **disabled**.
+
 ## Step 1: Deploy a DM cluster
 
 1. Install TiUP, and install [`dmctl`](/dm/dmctl-introduction.md) using TiUP: