diff --git a/camlibs/sierra/PROTOCOL b/camlibs/sierra/PROTOCOL
index 63444e123..0732110db 100644
--- a/camlibs/sierra/PROTOCOL
+++ b/camlibs/sierra/PROTOCOL
@@ -18,7 +18,7 @@ For further information , see http://photopc.sourceforge.net/protocol.html.
  14 (s)		current preview (captured)
  15
  16		battery life
- 17
+ 17		speed
  18
  19		brightness/contrast
  20		white balance