diff --git a/alpine-initramfs-ipv6/README.md b/alpine-initramfs-ipv6/README.md
index 826b93d..596b004 100644
--- a/alpine-initramfs-ipv6/README.md
+++ b/alpine-initramfs-ipv6/README.md
@@ -1,9 +1,16 @@
 # alpine-initramfs-ipv6
 
-ipv6 on alpinelinux initramfs
+This add ipv6 support for alpine initramfs.
 
 # /etc/mkinitfs/mkinitfs.conf
 ```
 features+= ip
 ```
-copy `features.d` `/etc/mkinitfs/features.d`
\ No newline at end of file
+
+* copy `features.d` `/etc/mkinitfs/features.d`
+
+# /etc/update-extlinux.conf
+
+```
+ip6=client-ip/gateway-ip/interface/dns/dns
+```
\ No newline at end of file