diff --git a/apm-sniffer/config/agent.config b/apm-sniffer/config/agent.config
index 0ea24d656015bfa0256a464e6b6974f85b2e58e0..3041be1f6b022513f406832f360fe82bb62460b7 100644
--- a/apm-sniffer/config/agent.config
+++ b/apm-sniffer/config/agent.config
@@ -46,3 +46,12 @@ logging.file_name=${SW_LOGGING_FILE_NAME:skywalking-api.log}
 
 # Logging level
 logging.level=${SW_LOGGING_LEVEL:DEBUG}
+
+# Logging dir
+# logging.dir=${SW_LOGGING_DIR:""}
+
+# Logging max_file_size, default: 300 * 1024 * 1024 = 314572800
+# logging.max_file_size=${SW_LOGGING_MAX_FILE_SIZE:314572800}
+
+# mysql plugin configuration
+# plugin.mysql.trace_sql_parameters=${SW_MYSQL_TRACE_SQL_PARAMETERS:false}
\ No newline at end of file