diff --git a/pvecm.adoc b/pvecm.adoc
index 0b1857e..26b52cf 100644
--- a/pvecm.adoc
+++ b/pvecm.adoc
@@ -74,6 +74,9 @@ Requirements
 
 * The root password of a cluster node is required for adding nodes.
 
+* Online migration of virtual machines is only supported when nodes have CPUs
+  from the same vendor. It might work otherwise, but this is never guaranteed.
+
 NOTE: It is not possible to mix {pve} 3.x and earlier with {pve} 4.X cluster
 nodes.
 
diff --git a/qm.adoc b/qm.adoc
index 37ea439..b1e22f9 100644
--- a/qm.adoc
+++ b/qm.adoc
@@ -1154,6 +1154,8 @@ For Live Migration to work, there are some things required:
 * The hosts have a working (and reliable) network connection.
 * The target host must have the same or higher versions of the
   {pve} packages. (It *might* work the other way, but this is never guaranteed)
+* The hosts have CPUs from the same vendor. (It *might* work otherwise, but this
+  is never guaranteed)
 
 Offline Migration
 ~~~~~~~~~~~~~~~~~