diff --git a/tools/packaging/kernel/configs/fragments/common/mmio.conf b/tools/packaging/kernel/configs/fragments/common/mmio.conf
index 5afc0b10b4..afaec1a379 100644
--- a/tools/packaging/kernel/configs/fragments/common/mmio.conf
+++ b/tools/packaging/kernel/configs/fragments/common/mmio.conf
@@ -1,3 +1,4 @@
+# !confidential
 # mmio devices are required for firecracker
 CONFIG_VIRTIO_MMIO=y
 CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y