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diff --git a/Documentation/tty.txt b/Documentation/tty.txt
index dab566047..8ff7bc2a0 100644
--- a/Documentation/tty.txt
+++ b/Documentation/tty.txt
@@ -80,6 +80,13 @@ receive_buf()	-	Hand buffers of bytes from the driver to the ldisc
 			for processing. Semantics currently rather
 			mysterious 8(
 
+receive_room()	-	Can be called by the driver layer at any time when
+			the ldisc is opened. The ldisc must be able to
+			handle the reported amount of data at that instant.
+			Synchronization between active receive_buf and
+			receive_room calls is down to the driver not the
+			ldisc. Must not sleep.
+
 write_wakeup()	-	May be called at any point between open and close.
 			The TTY_DO_WRITE_WAKEUP flag indicates if a call
 			is needed but always races versus calls. Thus the