diff --git a/prebuilt/common/bin/50-base.sh b/prebuilt/common/bin/50-base.sh
index 638d52d..59d9bc6 100644
--- a/prebuilt/common/bin/50-base.sh
+++ b/prebuilt/common/bin/50-base.sh
@@ -1,7 +1,7 @@
 #!/sbin/sh
 # 
-# /system/addon.d/50-base.sh
-# During a CM11 upgrade, this script backs up /system/etc/hosts,
+# /system/addon.d/50-cm.sh
+# During a CM12.1 upgrade, this script backs up /system/etc/hosts,
 # /system is formatted and reinstalled, then the file is restored.
 #
 
diff --git a/prebuilt/common/bin/backuptool.functions b/prebuilt/common/bin/backuptool.functions
index 9e9c756..0b45247 100644
--- a/prebuilt/common/bin/backuptool.functions
+++ b/prebuilt/common/bin/backuptool.functions
@@ -5,7 +5,7 @@
 
 export C=/tmp/backupdir
 export S=/system
-export V=5
+export V=12.1
 
 backup_file() {
   if [ -e "$1" ]; then
diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
index f6ed87d..f24eef1 100644
--- a/prebuilt/common/bin/backuptool.sh
+++ b/prebuilt/common/bin/backuptool.sh
@@ -5,7 +5,7 @@
 
 export C=/tmp/backupdir
 export S=/system
-export V=5
+export V=12.1
 
 # Scripts in /system/addon.d expect to find backuptool.functions in /tmp
 cp -f /tmp/install/bin/backuptool.functions /tmp