Putting a warning flag on a particular version

view story

http://unix.stackexchange.com – I have 4 versions of a file 1.21, 1.22, 1.23 and 1.24. After a month of time I came to know that the version 1.22 and 1.23 have some errors in them. Now I don't want anyone to use those versions. One way to solve it is to delete those versions, but I don't want to delete them. I just want to know a way so that if anyone checkout those obsolete versions they should get a warning or custom message that "don't use this version, this version has some problems". Is there any way to do this? Let me know, thanks. (HowTos)