diff --git a/docs/os/configuration/resizing-device-partition/index.md b/docs/os/configuration/resizing-device-partition/index.md
index 182a4f66..428d73e9 100644
--- a/docs/os/configuration/resizing-device-partition/index.md
+++ b/docs/os/configuration/resizing-device-partition/index.md
@@ -9,6 +9,8 @@ layout: os-default
 
 The `resize_device` cloud config option can be used to automatically extend the first partition to fill the size of it's device.
 
+Once the partition has been resized to fill the device, a `/var/lib/rancher/resizefs.done` file will be written to prevent the resize tools from being run again. If you need it to run again, delete that file and reboot.
+
 ```yaml
 #cloud-config
 rancher: