--- a/master/fsm_sii.c	Tue Jul 06 18:30:35 2010 +0200
+++ b/master/fsm_sii.c	Tue Jul 13 13:52:59 2010 +0200
@@ -277,7 +277,8 @@
 #endif
 
     if (EC_READ_U8(datagram->data + 1) & 0x20) {
-        EC_SLAVE_ERR(fsm->slave, "SII: Error on last SII command!\n");
+        EC_SLAVE_ERR(fsm->slave, "Error on last command while"
+                " reading from SII word 0x%04x.\n", fsm->word_offset);
         fsm->state = ec_fsm_sii_state_error;
         return;
     }