diff --git a/api/zi_module.hpp b/api/zi_module.hpp
index 9cca05c..ba27587 100644
--- a/api/zi_module.hpp
+++ b/api/zi_module.hpp
@@ -25,6 +25,9 @@ class ZIModule {
   virtual int32_t module_set_param(int32_t param_id, int32_t param_value) { return err::koperation_not_support; }
   virtual int32_t module_get_param(int32_t param_id, int32_t *param_value) { return err::koperation_not_support; }
 
+  // virtual int32_t module_set_state(int32_t state_id, int32_t state_value) { return err::koperation_not_support; }
+  // virtual int32_t module_get_state(int32_t state_id, int32_t *state_value) { return err::koperation_not_support; }
+
   virtual int32_t module_readio(int32_t *io) { return err::koperation_not_support; }
   virtual int32_t module_writeio(int32_t io) { return err::koperation_not_support; }