diff --git a/src/runtime/service_api_c.cpp b/src/runtime/service_api_c.cpp
index f211b6c160..c2c6b95263 100644
--- a/src/runtime/service_api_c.cpp
+++ b/src/runtime/service_api_c.cpp
@@ -540,8 +540,8 @@ bool run(const char *config_file,
 
     dump_log_cmd = dsn::command_manager::instance().register_single_command(
         "config-dump",
-        "Dump all configurations",
-        "[to-this-config-file]",
+        "Dump all configurations to a server local path or to stdout",
+        "[target_file]",
         [](const std::vector<std::string> &args) {
             std::ostringstream oss;
             std::ofstream off;