+STANDALONE TOOLS
+----------------
+
+New functionality could be provided using a standalone tool. If the functionality
+proves to be useful, then the standalone tool is declared obsolete and its
+functionality is copied to the main tool. Obsolete tools are removed after a
+long (years) depreciation period.
+
+Tools that are still in active use without an equivalent in *btrfs*:
+
+*btrfs-convert*:: in-place conversion from ext2/3/4 filesystems to btrfs
+*btrfstune*:: tweak some filesystem properties on a unmounted filesystem
+*btrfs-select-super*:: rescue tool to overwrite primary superblock from a spare copy
+*btrfs-find-root*:: rescue helper to find tree roots in a filesystem
+
+Deprecated and obsolete tools:
+
+*btrfs-debug-tree*:: moved to *btrfs inspect-internal dump-tree*. Removed from
+source distribution.
+*btrfs-show-super*:: moved to *btrfs inspect-internal dump-super*, standalone
+removed.
+*btrfs-zero-log*:: moved to *btrfs rescue zero-log*, standalone removed.
+