+@pindex redo-depfix
+@item redo-depfix
+ When you copy your worktree to different place, then copied files
+ ctime will change. And because recorded dependency information
+ differs from updated ctimes, out-of-date algorithm will fallback to
+ rereading the whole files for hash calculation, that is much slower.
+ If you do not want to rebuild your targets from the ground, then
+ @command{redo-depfix} can traverse through all dependency files and
+ check if they have non-altered ctime values and update them in place.
+