Supercell have added a neat feature in Clash Wars Anniversary Update.
Got an experienced War General your Clan relies on to dictate which bases to attack? Or perhaps you have a new recruit who could use some guidance during Clan Wars? The Clan War Tools are a new feature that allows you to add strategy notes on enemy bases and claim your targets!
During your Clan War, members in your war roster are able to tag an enemy base and leave a note on the Clan War map.
For the full update check HERE.