diff --git a/sdk/hginclude/utils.h b/sdk/hginclude/utils.h
index d48e0f2..29bc9d7 100644
--- a/sdk/hginclude/utils.h
+++ b/sdk/hginclude/utils.h
@@ -36,7 +36,7 @@ namespace utils
 	std::string target_file_from_link(const char* lnk_file);
 	std::string	get_ini_value(const char* seg, const char* key, const char* cfg_file);	// return "" if not found
 	std::string load_mini_file(const char* file, int* err);		// <= 1MB
-	int save_2_file(void* data, size_t len, const char* file);
+	int save_2_file(void* data, size_t len, const char* file, bool append = false);
 
 	const char* to_lower(std::string& str);	// return str.c_str()
 	const char* trim(std::string& str, const char* sp = "\r\n\t ");		// return str.c_str()