diff --git a/tests/manual/gdbdebugger/simple/app.cpp b/tests/manual/gdbdebugger/simple/app.cpp
index 36b3940701efc55f617b85d241e42236c995120a..af088d342358b183225a3dcbfc3e20854519dcad 100644
--- a/tests/manual/gdbdebugger/simple/app.cpp
+++ b/tests/manual/gdbdebugger/simple/app.cpp
@@ -373,6 +373,7 @@ struct Function
 
 void testFunction()
 {
+    // In order to use this, switch on the 'qDump__Function' in gdbmacros.py
     Function func("x", "sin(x)", 0, 1);
     func.max = 10;
     func.f = "cos(x)";