diff --git a/Documentation/mbox_protocol.md b/Documentation/mbox_protocol.md
index 3907742..45320dd 100644
--- a/Documentation/mbox_protocol.md
+++ b/Documentation/mbox_protocol.md
@@ -429,6 +429,15 @@
 		Args 1-2: reserved
 		Args 3-4: reserved
 		Args 5: Block size as power of two (encoded as a shift)
+		Args 6-7: Suggested Timeout (seconds)
+	Notes:
+		The suggested timeout is a hint to the host as to how long
+		it should wait after issuing a command to the BMC before it
+		times out waiting for a response. This is the maximum time
+		which the BMC thinks it could take to service any command which
+		the host could issue. This may be set to zero to indicate that
+		the BMC	does not wish to provide a hint in which case the host
+		must choose some reasonable value.
 
 Command:
 	GET_FLASH_INFO