diff --git a/README.adoc b/README.adoc
index 0de8dd8..ffaa4d2 100644
--- a/README.adoc
+++ b/README.adoc
@@ -1588,6 +1588,8 @@ cat f
 # can't open 'f': No such file or directory
 ....
 
+This can be good for automated tests, as it ensures that you are using a pristine unmodified system image every time.
+
 The main ingredients to get this working are:
 
 * `BR2_TARGET_ROOTFS_CPIO=y`: make Buildroot generate `output/images/rootfs.cpio` in addition to the other images.