diff --git a/Errors.md b/Errors.md
index dbe5e5e..c4f3151 100644
--- a/Errors.md
+++ b/Errors.md
@@ -6,7 +6,7 @@ Some errors that can be thrown by SESSINIT property #4 and potentially other pla
 | 2 | NAK_MAX_ORDINARY | TBD | |
 | 3 | NAK_MAX_PRIORITY | TBD | |
 | 4 | | | AssertionError! (Crash?) |
-| 5 | NAK_FATAL | TBD | Retry after 8-18 seconds |
+| 5 | NAK_FATAL | TBD | Retries |
 | 6 | NAK_BAD_PROTOCOL1 + NAK_BAD_PROTOCOL2 | TBD | |
 | 7 | NAK_BAD_CLIENTSW | TBD | |
 | 8 | | AssertionError! (Crash?) |
@@ -17,4 +17,9 @@ Some errors that can be thrown by SESSINIT property #4 and potentially other pla
 | 13 | NAK_BAD_PASSWORD | TBD | |
 | 14 | NAK_BAD_ACCOUNT | TBD | |
 | 15 | NAK_NOT_LOGGEDON | TBD | |
-| 16 | NAK_BAD_IPADDRESS | TBD | |
\ No newline at end of file
+| 16 | NAK_BAD_IPADDRESS | TBD | |
+| 17 | NAK_LOGGEDON | TBD | |
+| 21 | | The set of rooms you are in are quite full.
+Please wait several minutes and try again. | |
+| 100-103 | NAK_UNEXPECTED1+NAK_UNEXPECTED2 | TBD | Retries |
+| 104-107 | NAK_UNREACHABLE1+NAK_UNREACHABLE2+NAK_UNREACHABLE3+NAK_UNREACHABLE4 | TBD | Retries |