Filenames for the tag command, separated by spaces or commas. To include a space or comma in a file name, precede it with a backslash (see |option-backslash| about including spaces and backslashes). When a file name starts with "./", the '.' is replaced with the path of the current file. But only when the 'd' flag is not included in 'cpoptions'. Environment variables are expanded |:set_env|. Also see |tags-option|. "*" and other wildcards can be used to search for tags files in a directory tree. See |file-searching|. E.g., "/lib/** /tags" will find all files named "tags" below "/lib". The filename itself cannot contain wildcards, it is used as-is. E.g., "/lib/** /tags?" will find files called "tags?". The |tagfiles()| function can be used to get a list of the file names actually used. If Vim was compiled with the |+emacs_tags| feature, Emacs-style tag files are also supported. They are automatically recognized. The default value becomes "./tags,./TAGS,tags,TAGS", unless case differences are ignored (MS-Windows). |emacs-tags| The use of |:set+=| and |:set-=| is preferred when adding or removing file names from the list. This avoids problems when a future version uses another default.