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diff --git a/Changes-API.md b/Changes-API.md
index 00853f9..30687ce 100644
--- a/Changes-API.md
+++ b/Changes-API.md
@@ -1,83 +1,87 @@
# Changelog for HEJ API
This log lists only changes on the HEJ API. These are primarily code changes
relevant for calling HEJ as an API. This file should only be read as an addition
to `Changes.md`, where the main features are documented.
## Version 2.X
### 2.X.0
* Made `MatrixElement.tree_kin(...)` and `MatrixElement.tree_param(...)` public
* New class `CrossSectionAccumulator` to keep track of Cross Section of the
different subproccess
* New template struct `Parameters` similar to old `Weights`
- `Weights` are now an alias for `Parameters<double>`. Calling `Weights` did
not change
- `Weights.hh` was replaced by `Parameters.hh`. The old `Weights.hh` header
will be removed in HEJ Version 2.2.0
* Function to multiplication and division of `EventParameters.weight` by double
- This can be combined with `Parameters`, e.g.
`Parameters<EventParameters>*Weights`, see also `Events.parameters()`
- Moved `EventParameters` to `Parameters.hh` header
* Restructured `Event` class
- `Event` can now only be build from a (new) `Event::EventData` class
- Removed default constructor for `Event`
- `Event::EventData` replaces the old `UnclusteredEvent` struct.
- `UnclusteredEvent` is now deprecated, and will be removed in HEJ Version
2.3.0
- Removed `Event.unclustered()` function
- Added new member function `Events.parameters()`, to directly access
(underlying) `Parameters<EventParameters>`
- New member functions `begin_partons`, `end_partons` with aliases
`cbegin_partons`, `cend_partons` for constant iterators over
outgoing partons.
* New function `Event::EventData.reconstruct_intermediate()` to reconstruct
bosons from decays, e.g. `positron + nu_e => Wp`
* Added optional Colour charges to particles (`Particle.colour`)
- Colour connection in the HEJ limit can be generated via
`Event.generate_colours` (automatically done in the resummation)
- Colour configuration of input events can be checked with
`Event.is_leading_colour`
* New abstact `EventReader` class, as base for reading events from files
- Moved LHE file reader to `HEJ::LesHouchesReader`
- New `HEJ::HDF5Reader` to read `hdf5` files
+* New `BufferedEventReader` class that allows to put events back into
+ the reader.
* New function `Analysis.initialise(LHEF::HEPRUP const &)` to pass `HEPRUP` to
the analysis.
* Renamed `EventType::nonHEJ` to `EventType::non_resummable` and `is_HEJ()`
to `is_resummable()` such that Run card is consistent with internal workings
* new class `EWConstants` replaces previously hardcoded `vev`
- `EWConstants` have to be set in the general `config` and the
`MatrixElementConfig`
* Replaced `HepMCInterface` and `HepMCWriter` by `HepMCInterfaceX` and
`HepMCWriterX` respectivly, with `X` being the major version of HepMC (2 or 3)
* Added an auxiliary function to obtain a `std::string` from and
`EventDescription`
* New class `Unweighter` to do unweighting
* Export cmake target `HEJ::HEJ` to link directly against `libHEJ`
+* New `EventReweighter` member function `treatment` to query the
+ treatment with respect to resummation for the various event types.
## Version 2.0
### 2.0.6
* no further changes to API
### 2.0.5
* no further changes to API
### 2.0.4
* Fixed wrong path of `HEJ_INCLUDE_DIR` in `hej-config.cmake`
### 2.0.3
* no further changes to API
### 2.0.2
* no further changes to API
### 2.0.1
* no further changes to API
diff --git a/Changes.md b/Changes.md
index d341952..2722199 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,77 +1,80 @@
# Changelog
This is the log for changes to the HEJ program. Further changes to the HEJ API
are documented in `Changes-API.md`. If you are using HEJ as a library, please
also read the changes there.
## Version 2.X
### 2.X.0
* Resummation for W bosons with jets
- New subleading processes `extremal qqx` & `central qqx` for a quark and
anti-quark in the final state, e.g. `g g => u d_bar Wm g` (the other
subleading processes also work with W's)
- `HEJFOG` can generate mutliple jets together with a (off-shell) W bosons
decaying into lepton & neutrino
* Resummation can now be performed on `unordered` subleading processes
in pure jets.
* Allow multiplication and division of multiple scale functions e.g.
`H_T/2*m_j1j2`
* Print cross sections at end of run
* Follow HepMC convention for particle Status codes: incoming = 11,
decaying = 2, outgoing = 1 (unchanged)
* Partons now have a Colour charge
- Colours are read from and written to LHE files
- For reweighted events the colours are created according to leading colour in
the FKL limit
* Grouped `event treatment` for subleading channels together in runcard
- Rename `non-HEJ` processes to `non-resummable`
* Read electro-weak constants from input
- new mandatory setting `vev` to change vacuum expectation value
- new mandatory settings `particle properties` to specify mass & width of
bosons
- FOG: decays are now specified in `decays` setting (previously under
`particle properties`)
* Allow changing the regulator lambda in input (`regulator parameter`, only for
advanced users)
* Use relative fraction for soft transverse momentum in extremal jets (`max ext
soft pt fraction`). This supersedes `min extparton pt`, which is now
deprecated and will be removed in future versions.
* Use `git-lfs` for raw data in test (`make test` now requires `git-lfs`)
* Added support to read `hdf5` event files suggested in
[arXiv:1905.05120](https://arxiv.org/abs/1905.05120) (needs
[HighFive](https://github.com/BlueBrain/HighFive))
* Support input with avarage weight equal to the cross section (`IDWTUP=1 or 4`)
* Dropped support for HepMC 3.0.0, either HepMC version 2 or >3.1 is required
- It is now possible to write out both HepMC 2 and HepMC 3 events at the same
time
* Optional setting to specify maximal number of Fixed Order events (`max
events`, default is all)
-* Added option to unweight only resummation events (`unweight: resummation`)
+* Added option to unweight only resummation events
+ (`unweight: {type: resummation}`)
+* Added option for partially unweighting resummation events, similar to
+ the fixed-order generator.
## 2.0.6
* Fixed compiling rivet when YODA headers are _outside_ of rivet directory
## 2.0.5
* Fixed event classification for input not ordered in rapidity
### 2.0.4
* Fixed wrong path of `HEJ_INCLUDE_DIR` in `hej-config.cmake`
### 2.0.3
* Fixed parsing of (numerical factor) * (base scale) in configuration
* Don't change scale names, but sanitise Rivet output file names instead
### 2.0.2
* Changed scale names to `"_over_"` and `"_times_"` for proper file names (was
`"/"` and `"*"` before)
### 2.0.1
* Fixed name of fixed-order generator in error message.

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