diff --git a/README.md b/README.md
index fb9b924e8..0930091ec 100644
--- a/README.md
+++ b/README.md
@@ -6,5 +6,14 @@ Something is wrong with ImageBuilder. You need to execute the following code to
 VERSION=<openwrt-imagebuilder-version> # e.g. 23.05.3
 TARGET=<openwrt-imagebuilder-target> # e.g. x86
 SUBTARGET=<openwrt-imagebuilder-subtarget> # e.g. 64
-sed -i '/src\/gz openwrt_core /{s|downloads.openwrt.org/releases/$VERSION|github.com/fantastic-packages/rebuild/raw/$VERSION-$TARGET-$SUBTARGET|}' repositories.conf
+sed -i "/src\/gz openwrt_core /{s|downloads.openwrt.org/releases/$VERSION|github.com/fantastic-packages/rebuild/raw/$VERSION-$TARGET-$SUBTARGET|}" repositories.conf
+```
+
+Something is wrong with system image. You need to execute the following code to fix it.
+
+``` shell
+VERSION=<openwrt-imagebuilder-version> # e.g. 23.05.3
+TARGET=<openwrt-imagebuilder-target> # e.g. x86
+SUBTARGET=<openwrt-imagebuilder-subtarget> # e.g. 64
+sed -i "/src\/gz openwrt_core /{s|downloads.openwrt.org/releases/$VERSION|github.com/fantastic-packages/rebuild/raw/$VERSION-$TARGET-$SUBTARGET|}" /etc/opkg/distfeeds.conf
 ```