doc (stat): clarify: there are two sets of format directives

* doc/coreutils.texi (stat invocation): Clarify description of
--file-system format directives.

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 2d0ce62..8c54fc4 100644 (file)
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -10308,7 +10308,8 @@ The valid @var{format} directives for files with @option{--format} and
 @item %Z - Time of last change as seconds since Epoch
 @end itemize
 
-The valid format sequences for file systems are:
+When listing file system information (@option{--file-system} (@option{-f})),
+you must use a different set of @var{format} directives:
 
 @itemize @bullet
 @item %a - Free blocks available to non-super-user