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Mention ROOT I/O does not support Bit-fields #1183

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Mention ROOT I/O does not support Bit-fields #1183

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2 changes: 2 additions & 0 deletions manual/io_custom_classes/index.md
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Expand Up @@ -253,6 +253,8 @@ For ROOT to be able to store a class, it must have a public default constructor

ROOT currently does not support I/O of `std::shared_ptr`, `std::optional`, `std::variant` and classes with data members of these types (unless they are marked as "transient").

ROOT currently does not support I/O for C++ [`Bit-fields`](https://en.cppreference.com/w/cpp/language/bit_field.html) with a class.

ROOT can store and retrieve data members of pointer type but not reference type.

Data members, and in particular pointer data members, _must_ be initialized by the class constructor used by ROOT I/O (most typically, the default constructor):
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