diff --git a/part.btrfs b/debian/part.btrfs.sh
similarity index 86%
rename from part.btrfs
rename to debian/part.btrfs.sh
index 2782415..16320a5 100755
--- a/part.btrfs
+++ b/debian/part.btrfs.sh
@@ -18,6 +18,8 @@ btrfs subvolume create /target/usr
 btrfs subvolume create /target/var
 
 # Specific actions for "etc" subvolume
+## In case the installation is based on LUKS/cryptsetup, we need to keep
+## the generated cryptsetup's configuration.
 mv /target/etc /target/etc.temp
 btrfs subvolume create /target/etc
 mv /target/etc.temp/* /target/etc