diff --git a/Errors.md b/Errors.md
index 98cebf3..241a840 100644
--- a/Errors.md
+++ b/Errors.md
@@ -5,4 +5,6 @@ Some errors that can be thrown by SESSINIT property #4 and potentially other pla
 | 1 | NAK_BAD_USER | TBD | |
 | 2 | NAK_MAX_ORDINARY | TBD | |
 | 3 | NAK_MAX_PRIORITY | TBD | |
-| 4 | | | AssertionError! (Crash?) |
\ No newline at end of file
+| 4 | | | AssertionError! (Crash?) |
+| 5 | NAK_FATAL | TBD | Retry after 8-18 seconds |
+| 6 | NAK_BAD_PROTOCOL1 + NAK_BAD_PROTOCOL2 | TBD | |
\ No newline at end of file