usb: document device authorization

[cascardo/linux.git] / Documentation / tty.txt

diff --git a/Documentation/tty.txt b/Documentation/tty.txt
index 5f799e6..048a876 100644 (file)
--- a/Documentation/tty.txt
+++ b/Documentation/tty.txt
@@ -108,7 +108,9 @@ hardware driver through the function pointers within the tty->driver
 structure:
 
 write()                        Write a block of characters to the tty device.
-                       Returns the number of characters accepted.
+                       Returns the number of characters accepted. The
+                       character buffer passed to this method is already
+                       in kernel space.
 
 put_char()             Queues a character for writing to the tty device.
                        If there is no room in the queue, the character is