diff --git a/docs/migration.html.in b/docs/migration.html.in
index 8efdd7f549..27689559b3 100644
--- a/docs/migration.html.in
+++ b/docs/migration.html.in
@@ -148,8 +148,9 @@
       <code>virsh dumpxml</code> on source host followed by
       <code>virsh define</code> on destination host, as offline migration
       will run the pre-migration hook to update the domain XML on
-      destination host. Currently, copying non-shared storage is not
-      supported during offline migration.
+      destination host. Currently, copying non-shared storage or other file
+      based storages (e.g. UEFI variable storage) is not supported during
+      offline migration.
     </p>
 
     <h2><a name="uris">Migration URIs</a></h2>
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index fa82e49b71..9ba9f49a2d 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -3574,6 +3574,10 @@ virDomainMigrateUnmanaged(virDomainPtr domain,
  * not support this feature and will return an error if bandwidth
  * is not 0.
  *
+ * Users should note that implementation of VIR_MIGRATE_OFFLINE
+ * flag in some drivers does not copy storage or any other file
+ * based storage (e.g. UEFI variable storage).
+ *
  * Enabling the VIR_MIGRATE_POSTCOPY flag tells libvirt to enable post-copy
  * migration.  Use virDomainMigrateStartPostCopy to switch migration into
  * the post-copy mode.  See virDomainMigrateStartPostCopy for more details
@@ -3791,6 +3795,10 @@ virDomainMigrate(virDomainPtr domain,
  * not support this feature and will return an error if bandwidth
  * is not 0.
  *
+ * Users should note that implementation of VIR_MIGRATE_OFFLINE
+ * flag in some drivers does not copy storage or any other file
+ * based storage (e.g. UEFI variable storage).
+ *
  * Enabling the VIR_MIGRATE_POSTCOPY flag tells libvirt to enable post-copy
  * migration.  Use virDomainMigrateStartPostCopy to switch migration into
  * the post-copy mode.  See virDomainMigrateStartPostCopy for more details
@@ -3980,6 +3988,10 @@ virDomainMigrate2(virDomainPtr domain,
  * can use either VIR_MIGRATE_NON_SHARED_DISK or
  * VIR_MIGRATE_NON_SHARED_INC as they are mutually exclusive.
  *
+ * Users should note that implementation of VIR_MIGRATE_OFFLINE
+ * flag in some drivers does not copy storage or any other file
+ * based storage (e.g. UEFI variable storage).
+ *
  * Enabling the VIR_MIGRATE_POSTCOPY flag tells libvirt to enable post-copy
  * migration.  Use virDomainMigrateStartPostCopy to switch migration into
  * the post-copy mode.  See virDomainMigrateStartPostCopy for more details