[commit: ghc] master: Add a note on building documentation (f846945)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/f846945cfa4af667176ec1181c6904a6ba28dff3/ghc

>---------------------------------------------------------------

commit f846945cfa4af667176ec1181c6904a6ba28dff3
Author: Andrey Mokhov <andrey.mokhov at gmail.com>
Date:   Wed Nov 1 12:03:12 2017 +0000

    Add a note on building documentation
    
    See #414


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f846945cfa4af667176ec1181c6904a6ba28dff3
 README.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/README.md b/README.md
index b25e31a..90db95a 100644
--- a/README.md
+++ b/README.md
@@ -109,6 +109,13 @@ use `hadrian/UserSettings.hs` for the same purpose, see [documentation](doc/user
 * `build -B` forces Shake to rerun all rules, even if the previous build results are
 are still up-to-date.
 
+#### Documentation
+
+To build GHC documentation, run `build docs --haddock`. The `docs` is the documentation
+target, and the `--haddock` flag enables building Haddock. This is a temporary solution
+and [we plan](https://github.com/snowleopard/hadrian/issues/414) to simplify this command
+to `build docs`.
+
 #### Source distribution
 
 To build a GHC source distribution tarball, run Hadrian with the `sdist-ghc` target.