diff --git a/conf/manjaro-tools.conf b/conf/manjaro-tools.conf
index 780920b..888848a 100644
--- a/conf/manjaro-tools.conf
+++ b/conf/manjaro-tools.conf
@@ -79,4 +79,5 @@
 # iso_checksum=md5
 
 # experimental; use overlayfs instead of aufs
+# requires minimum 4.0 kernel on the build host
 # use_overlayfs="false"