doc: mention that POSIX.1-2024 added dd iflag=fullblock

* doc/coreutils.texi (dd invocation): Document that POSIX.1-2024 added
iflag=fullblock.

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index e05d3faf7459a1153a56dbbb406b14a7f2cbb24c..141cbc1f82e58acc442965bc0778680968ece1b8 100644 (file)
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -9921,7 +9921,8 @@ interpreted as a block count rather than a count of read operations.
 
 @end table
 
-These flags are all GNU extensions to POSIX.
+These flags are all GNU extensions to POSIX, except for @samp{fullblock}
+which was added by POSIX.1-2024.
 They are not supported on all systems, and @samp{dd} rejects
 attempts to use them when they are not supported.  When reading from
 standard input or writing to standard output, the @samp{nofollow} and