changes entry

Author: WardBrian

master_changes.md

@@ -62,6 +62,7 @@ users)
 ## Clean
 
 ## Env
+  * Env now sets `XDG_DATA_DIRS` to include the opam share directory and `FPATH` to include share/zsh/site-functions. Tools which install shell autocomplete scripts in these directories will now be picked up automatically. [#6427 @WardBrian]
 
 ## Opamfile