--- a/doc/gdb.texinfo
+++ b/doc/gdb.texinfo
@@ -12069,6 +12069,7 @@ of trace data, via the @code{target tfil
 
 @kindex tsave
 @item tsave [ -r ] @var{filename}
+@itemx tsave [-ctf] @var{dirname}
 Save the trace data to @var{filename}.  By default, this command
 assumes that @var{filename} refers to the host filesystem, so if
 necessary @value{GDBN} will copy raw trace data up from the target and
@@ -12077,16 +12078,45 @@ optional argument @code{-r} (``remote'')
 the data directly into @var{filename} in its own filesystem, which may be
 more efficient if the trace buffer is very large.  (Note, however, that
 @code{target tfile} can only read from files accessible to the host.)
+By default, this command will save trace frame into tfile format.
+You can supply the optional argument @code{-ctf} to save date in CTF
+format.  The @dfn{Common Trace Format} (CTF) is proposed as a trace format
+that suits the needs of the embedded, telecom, high-performance
+and kernel communities.  Please goto @indicateurl{http://www.efficios.com/ctf}
+to get more information.
 
 @kindex target tfile
 @kindex tfile
 @item target tfile @var{filename}
-Use the file named @var{filename} as a source of trace data.  Commands
-that examine data work as they do with a live target, but it is not
-possible to run any new trace experiments.  @code{tstatus} will report
-the state of the trace run at the moment the data was saved, as well
-as the current trace frame you are examining.  @var{filename} must be
-on a filesystem accessible to the host.
+@kindex target ctf
+@kindex ctf
+@itemx target ctf @var{dirname}
+Use the file named @var{filename} or directory named @var{dirname} as
+a source of trace data.  Commands that examine data work as they do with
+a live target, but it is not possible to run any new trace experiments.
+@code{tstatus} will report the state of the trace run at the moment
+the data was saved, as well as the current trace frame you are examining.
+@var{filename} or @var{dirname} must be on a filesystem accessible to
+the host.
+
+@smallexample
+(@value{GDBP}) target ctf ctf.ctf
+(@value{GDBP}) tfind
+warning: $d is not support.
+warning: $c is not support.
+warning: $d is not support.
+warning: $c is not support.
+Found trace frame 0, tracepoint 2
+../../../gdb/gdb/testsuite/gdb.trace/ctf.c:24
+(@value{GDBP}) tdump
+$d = void
+$c = void
+$b = 1
+$a = 0
+$i = 0
+(@value{GDBP}) p $b
+$1 = 1
+@end smallexample
 
 @end table