diff --git a/examples/simple/class/CENTOS.var b/examples/simple/class/CENTOS.var
index 467ed2751..1ec7250de 100644
--- a/examples/simple/class/CENTOS.var
+++ b/examples/simple/class/CENTOS.var
@@ -3,5 +3,7 @@ KEYMAP=us
 DEFAULTLOCALE=en_US.UTF-8
 SUPPORTEDLOCALE=en_US.UTF-8:en_US:en
 
-# if you install much software and have only few RAM, disable the RAM disks
-FAI_RAMDISKS="$target/var/lib/rpm $target/var/cache/yum"
+# if you install much software and have only few RAM, use the RAM disk
+# not for var/cache/yum
+#FAI_RAMDISKS="$target/var/lib/rpm $target/var/cache/yum"
+FAI_RAMDISKS="$target/var/lib/rpm"