diff --git a/casadm/extended_err_msg.c b/casadm/extended_err_msg.c
index 4f9e14e..96a6c5d 100644
--- a/casadm/extended_err_msg.c
+++ b/casadm/extended_err_msg.c
@@ -69,6 +69,10 @@ struct {
 		OCF_ERR_CORE_EXIST,
 		"Core id already used"
 	},
+	{
+		OCF_ERR_CORE_UUID_EXISTS,
+		"Device already added as a core"
+	},
 	{
 		OCF_ERR_CORE_NOT_AVAIL,
 		"Core device not available"