diff --git a/plugin/output/splunk/README.md b/plugin/output/splunk/README.md
index d2d4de1a5..c74c57f82 100755
--- a/plugin/output/splunk/README.md
+++ b/plugin/output/splunk/README.md
@@ -8,7 +8,7 @@ A full URI address of splunk HEC endpoint. Format: `http://127.0.0.1:8088/servic
 
 <br>
 
-**`token`** *`string`* 
+**`token`** *`string`* *`required`* 
 
 Token for an authentication for a HEC endpoint.
 
@@ -20,6 +20,12 @@ How many workers will be instantiated to send batches.
 
 <br>
 
+**`request_timeout`** *`cfg.Duration`* *`default=1s`* 
+
+Client timeout when sends requests to HTTP Event Collector.
+
+<br>
+
 **`batch_size`** *`cfg.Expression`* *`default=capacity/4`* 
 
 A maximum quantity of events to pack into one batch.