From a94c27fd5cb35cfa24ecaa75fe9f1adf0689844c Mon Sep 17 00:00:00 2001
From: kubotat <tkubota@ctc-america.com>
Date: Wed, 11 Oct 2023 17:55:55 +0000
Subject: [PATCH] update README.md

Signed-off-by: kubotat <tkubota@ctc-america.com>
---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index ae336c2..e4ad29d 100644
--- a/README.md
+++ b/README.md
@@ -517,6 +517,7 @@ You need to install rdkafka gem.
       exclude_topic_key     (bool) :default => false
       exclude_partition_key (bool) :default => false
       discard_kafka_delivery_failed (bool) :default => false (No discard)
+      discard_kafka_delivery_failed_regex (regexp) :default => nil (No discard)
       use_event_time        (bool) :default => false
 
       # same with kafka2
@@ -559,6 +560,9 @@ You need to install rdkafka gem.
       max_enqueue_bytes_per_second (integer) :default => nil
     </match>
 
+`rdkafka2` supports `discard_kafka_delivery_failed_regex` parameter:
+- `discard_kafka_delivery_failed_regex` - default: nil - discard the record where the Kafka::DeliveryFailed occurred and the emitted message matches the given regex pattern, such as `/unknown_topic/`. 
+
 If you use v0.12, use `rdkafka` instead.
 
     <match kafka.**>