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-rw-r--r--doc/openocd.texi2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/openocd.texi b/doc/openocd.texi
index e839191b..7e51c470 100644
--- a/doc/openocd.texi
+++ b/doc/openocd.texi
@@ -2564,6 +2564,8 @@ roots at @var{bus} and walks down the physical ports, with each
@var{port} option specifying a deeper level in the bus topology, the last
@var{port} denoting where the target adapter is actually plugged.
The USB bus topology can be queried with the command @emph{lsusb -t}.
+
+This command is only available if your libusb1 is at least version 1.0.16.
@end deffn
@deffn {Config Command} {ftdi_channel} channel