diff --git a/tests/manual/debugger/simple/simple_test_app.cpp b/tests/manual/debugger/simple/simple_test_app.cpp
index 58a87725e1f..1d0afbc44ff 100644
--- a/tests/manual/debugger/simple/simple_test_app.cpp
+++ b/tests/manual/debugger/simple/simple_test_app.cpp
@@ -62,6 +62,8 @@
 // Same as 1, except that the debugger will stop automatically when
 // a test after a BREAK_HERE failed
 // Default: 0
+// Before using this, make sure that "Show a message box when receiving a signal"
+// is disabled in "Tools" -> "Options..." -> "Debugger" -> "GDB".
 #ifndef USE_AUTORUN
 #define USE_AUTORUN 0
 #endif