diff --git a/acl-migrate/README.md b/acl-migrate/README.md
index 71115e0..6659371 100644
--- a/acl-migrate/README.md
+++ b/acl-migrate/README.md
@@ -17,6 +17,9 @@ update to verify that expected access control behavior is intact.
 
 Make sure you have `aws` and `frostfs-cli` commands available.
 
+Make sure S3 gateway is running with `kludge.acl_enabled: true` setting to
+create buckets with extended ACLs.
+
 To run these scripts create `env` file `cp env.example env`
 
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