Index: sources/update/UpdateProtocol.h
===================================================================
diff -u -rc44c380d779b62aafe1f6eba414f3f8f4dc6d592 -r2ee835c4c687263fd8852a431db1223cc0e8055c
--- sources/update/UpdateProtocol.h	(.../UpdateProtocol.h)	(revision c44c380d779b62aafe1f6eba414f3f8f4dc6d592)
+++ sources/update/UpdateProtocol.h	(.../UpdateProtocol.h)	(revision 2ee835c4c687263fd8852a431db1223cc0e8055c)
@@ -191,7 +191,7 @@
  */
 struct SwUpdateResponse {
     uint8   id;                     ///< Command/response slot ID.
-    uint8   ackNack;                ///< 1=Ack, 0=Nack.
+    uint8   ackNack;                ///< 1=Ack, 0=Nack, >1 means sleep 200ms*(ackNack-1).
     uint16  rand;                   ///< Whitens the data.
     uint32  token;                  ///< Security token.    
 };