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 # 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 2.1
 
+Implemented W boson with jets for complete set of first subleading processes
+(unordered gluon, central and extremal quark-antiquark pair), see
+[arXiv:TODO](https://arxiv.org/abs/TODO). Ported unordered gluon emissions for
+pure jets from HEJ 1. Additionally this release include many changes, when using
+HEJ as a library (see Changes-API).
 ### 2.1.0
 
 * 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: {type: resummation}`)
 * Added option for partially unweighting resummation events, similar to
   the fixed-order generator.
 
 ## Version 2.0
 
+First release of HEJ 2. Complete code rewrite compared to HEJ 1. Improved
+matching to Fixed Order ([arXiv:1805.04446](https://arxiv.org/abs/1805.04446)).
+Implemented processes: Higgs boson with jets (FKL and unordered gluon emission,
+with finite quark mass loop,
+[arXiv:1812.08072](https://arxiv.org/abs/1812.08072)), and pure jets (only FKL).
+See [arXiv:1902.08430](https://arxiv.org/abs/1902.08430)
+
+
 ### 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.
 
 ### 2.0.0
 
 * First release