diff --git a/board/czechlight/clearfog/mk-rauc-bundle.sh b/board/czechlight/clearfog/mk-rauc-bundle.sh
index 8d82432..12241fb 100755
--- a/board/czechlight/clearfog/mk-rauc-bundle.sh
+++ b/board/czechlight/clearfog/mk-rauc-bundle.sh
@@ -3,19 +3,30 @@
 RAUC_BUILD_DIR=${BUILD_DIR}/rauc-work-tmp
 RAUC_IMAGE=${BINARIES_DIR}/update.raucb
 ROOTFS_NAME=rootfs.tar.xz
+EMPTY_TAR_NAME=cfg.tar.xz
+RAUC_HOOK=${RAUC_BUILD_DIR}/hook.sh
 
 rm -rf ${RAUC_BUILD_DIR}
 mkdir ${RAUC_BUILD_DIR}
 rm -f ${RAUC_IMAGE}
 
 ln ${BINARIES_DIR}/${ROOTFS_NAME} ${RAUC_BUILD_DIR}/
+tar -cJf ${RAUC_BUILD_DIR}/${EMPTY_TAR_NAME} -T /dev/null
+cp ${BR2_EXTERNAL_CZECHLIGHT_PATH}/board/czechlight/common/rauc-hook.sh ${RAUC_HOOK}
 cat > ${RAUC_BUILD_DIR}/manifest.raucm << EOF
 [update]
 compatible=czechlight-clearfog
 version=dev
 
+[hooks]
+filename=hook.sh
+
 [image.rootfs]
 filename=${ROOTFS_NAME}
+
+[image.cfg]
+filename=${EMPTY_TAR_NAME}
+hooks=post-install
 EOF
 
 rauc \
diff --git a/board/czechlight/common/rauc-hook.sh b/board/czechlight/common/rauc-hook.sh
new file mode 100755
index 0000000..65401d6
--- /dev/null
+++ b/board/czechlight/common/rauc-hook.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+case "$1" in
+  slot-post-install)
+    case "$RAUC_SLOT_CLASS" in
+      cfg)
+        if [[ -d /cfg/etc ]]; then
+          cp -a /cfg/etc ${RAUC_SLOT_MOUNT_POINT}/
+        fi
+        ;;
+      *)
+        echo "Internal error: hook mismatched"
+        exit 11
+    esac
+    ;;
+  *)
+    echo "Internal error: unrecognized hook"
+    exit 11
+    ;;
+esac
+
+exit 0