diff --git a/20.md b/20.md
index 8bd7ab57..6c81cbe0 100644
--- a/20.md
+++ b/20.md
@@ -27,6 +27,8 @@ The `message` SHOULD start with `pow:` if the event doesn't meet some proof-of-w
 
 The `message` SHOULD start with `rate-limited:` if the event was rejected due to rate limiting techniques.
 
+The `message` SHOULD start with `error:` if the event failed to save due to a server issue.
+
 Ephemeral events are not acknowledged with OK responses, unless there is a failure.
 
 If the event or `EVENT` command is malformed and could not be parsed, a NOTICE message SHOULD be used instead of a command result. This NIP only applies to non-malformed EVENT commands.
@@ -67,6 +69,10 @@ Event rejected, insufficient proof-of-work difficulty
 
     ["OK", "b1a649ebe8...", false, "pow: difficulty 26 is less than 30"]
 
+Event failed to save, 
+
+    ["OK", "b1a649ebe8...", false, "error: could not connect to the database"]
+
 
 
 Client Handling