[RelNotes] Mention Minuit 2 migration to std::span

hahnjo · Sep 9, 2024 · b81f1ca · b81f1ca
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diff --git a/README/ReleaseNotes/v634/index.md b/README/ReleaseNotes/v634/index.md
@@ -116,6 +116,10 @@ The [TUnfold package](https://www.desy.de/~sschmitt/tunfold.html) inside ROOT is
 
 ## Math Libraries
 
+### Usage of `std::span<const double>` in Minuit 2 interfaces
+
+To avoid forcing the user to do manual memory allocations via `std::vector`, the interfaces of Minuit 2 function adapter classes like `ROOT::Minuit2::FCNBase` or `ROOT::Minuit2::FCNGradientBase` were changed to accept `std::span<const double>` arguments instead of `std::vector<double> const&`.
+This should have minimal impact on users, since one should usuall use Minuit 2 via the `ROOT::Math::Minimizer` interface, which is unchanged.
 
 ## RooFit Libraries