diff --git a/Examples/test-suite/director_guard.i b/Examples/test-suite/director_guard.i
index 188578dfd..daaed6b89 100644
--- a/Examples/test-suite/director_guard.i
+++ b/Examples/test-suite/director_guard.i
@@ -1,5 +1,9 @@
+// This test is for testing director_guard.swg and director thread safety
+// Note: other languages should define SWIG_THREADS instead of the threads="1" module Python option
 %module(directors="1", threads="1") director_guard;
 
+%warnfilter(SWIGWARN_TYPEMAP_THREAD_UNSAFE,SWIGWARN_TYPEMAP_DIRECTOROUT_PTR) Callback::run;
+
 %feature("director") Callback;
 
 %inline %{