diff --git a/apm-sniffer/config/agent.config b/apm-sniffer/config/agent.config
index 327d9ef0f77a196d879c4c84f1de5b24622770bb..0ea24d656015bfa0256a464e6b6974f85b2e58e0 100644
--- a/apm-sniffer/config/agent.config
+++ b/apm-sniffer/config/agent.config
@@ -41,5 +41,8 @@ agent.service_name=${SW_AGENT_NAME:Your_ApplicationName}
 # Backend service addresses.
 collector.backend_service=${SW_AGENT_COLLECTOR_BACKEND_SERVICES:127.0.0.1:11800}
 
+# Logging file_name
+logging.file_name=${SW_LOGGING_FILE_NAME:skywalking-api.log}
+
 # Logging level
 logging.level=${SW_LOGGING_LEVEL:DEBUG}