diff --git a/core/iwasm/runtime/include/lib_export.h b/core/iwasm/runtime/include/lib_export.h
index e70a5aaba..e5eb6b7ee 100644
--- a/core/iwasm/runtime/include/lib_export.h
+++ b/core/iwasm/runtime/include/lib_export.h
@@ -39,6 +39,22 @@ typedef struct NativeSymbol {
 int
 get_base_lib_export_apis(NativeSymbol **p_base_lib_apis);
 
+/**
+ * Get the exported APIs of extended lib, this API isn't provided by WASM VM,
+ * it must be provided by developer to register the extended native APIs,
+ * for example, developer can register his native APIs to extended_native_symbol_defs,
+ * array, and include file ext_lib_export.h which implements this API.
+ * And if developer hasn't any native API to register, he can define an empty
+ * extended_native_symbol_defs array, and then include file ext_lib_export.h to
+ * implements this API.
+ *
+ * @param p_base_lib_apis return the exported API array of extend lib
+ *
+ * @return the number of the exported API
+ */
+int
+get_extend_lib_export_apis(NativeSymbol **p_base_lib_apis);
+
 #ifdef __cplusplus
 }
 #endif