diff --git a/twain/twain/huagaods.cpp b/twain/twain/huagaods.cpp
index caa2c13..27febac 100644
--- a/twain/twain/huagaods.cpp
+++ b/twain/twain/huagaods.cpp
@@ -988,6 +988,7 @@ Result huagao_ds::identityOpenDs(const Identity& id)
 		return bummer();
 	}
 
+	load_sane_util::to_log(3, L"huagao_ds::identityOpenDs(%04X) ...\r\n", PRODUCT_PID);
 	Identity target(id);
 	Result result = huagao_ds::selectIdentity(target);
 	if (scanner_.get())