diff --git a/content/os/v1.x/en/installation/running-rancheros/server/pxe/_index.md b/content/os/v1.x/en/installation/running-rancheros/server/pxe/_index.md
index a88fe9ea4b3..4041c3cf2cf 100644
--- a/content/os/v1.x/en/installation/running-rancheros/server/pxe/_index.md
+++ b/content/os/v1.x/en/installation/running-rancheros/server/pxe/_index.md
@@ -10,11 +10,15 @@ weight: 112
 # Location of Kernel/Initrd images
 set base-url http://releases.rancher.com/os/latest
 
-kernel ${base-url}/vmlinuz rancher.state.dev=LABEL=RANCHER_STATE rancher.state.autoformat=[/dev/sda] rancher.cloud_init.datasources=[url:http://example.com/cloud-config]
+kernel ${base-url}/vmlinuz rancher.state.dev=LABEL=RANCHER_STATE rancher.state.autoformat=[/dev/sda] rancher.state.wait rancher.cloud_init.datasources=[url:http://example.com/cloud-config]
 initrd ${base-url}/initrd
 boot
 ```
 
+If you want to autoformat the disk when booting by iPXE, you should add the `rancher.state.autoformat` part to kernel cmdline. However, this does not install the bootloader to disk, so you cannot upgrade RancherOS.
+
+If you don't add `rancher.state.autoformat`, RancherOS will run completely in memory, you can execute `ros install` to install to disk.
+
 ### Hiding sensitive kernel commandline parameters
 
 From RancherOS v0.9.0, secrets can be put on the `kernel` parameters line afer a `--` double dash, and they will be not be shown in any `/proc/cmdline`. These parameters