Add NOTE (#4968)

pybind · Dec 12, 2023 · a5b0cdc · a5b0cdc
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diff --git a/README_smart_holder.rst b/README_smart_holder.rst
@@ -107,6 +107,7 @@ There are three small differences compared to Classic pybind11:
   ``#include <pybind11/pybind11.h>``.
 
 - The ``PYBIND11_SMART_HOLDER_TYPE_CASTERS(Foo)`` macro is needed.
+  — NOTE: This macro needs to be in the global namespace.
 
 - ``py::classh`` is used instead of ``py::class_``.