diff --git a/cloudinit/config/cc_disk_setup.py b/cloudinit/config/cc_disk_setup.py
index 3402af02621..4f85e71813d 100644
--- a/cloudinit/config/cc_disk_setup.py
+++ b/cloudinit/config/cc_disk_setup.py
@@ -916,6 +916,9 @@ def mkfs(fs_cfg):
     if not partition or partition.isdigit():
         # Handle manual definition of partition
         if partition.isdigit():
+            # nvme support
+            # https://github.com/torvalds/linux/blob/45db3ab/block/partitions
+            # /core.c#L330
             if device[-1].isdigit():
                 device = f"{device}p"
             device = "%s%s" % (device, partition)