Add zlib-devel to the set of pacman packages we ask people to install on Windows.

Also make windows.md a bit nicer in general.

--
MOS_MIGRATED_REVID=115449272

1 files changed, 10 insertions, 7 deletions

diff --git a/site/docs/windows.md b/site/docs/windows.md
index d56c794620..f12229fdf0 100644
--- a/site/docs/windows.md
+++ b/site/docs/windows.md
@@ -10,24 +10,27 @@ Windows support is highly experimental. Known issues are [marked with
 label "Windows"](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+is%3Aopen+label%3AWindows)
 on github issues.
 
-We currently support only 64bit Windows 7 or higher.
+We currently support only 64 bit Windows 7 or higher and we can only compile
+msys2 binaries.
+
 To bootstrap Bazel on Windows, you will need:
 
 *    Java JDK 8 or later
-*    [msys2](https://msys2.github.io/) (need to be installed at ``C:\msys64\``).
-*    Several MSYS packages (gcc, git, curl, zip, unzip): use ``pacman`` command
-     to install those.
+*    [msys2](https://msys2.github.io/) (need to be installed at
+     ``C:\tools\msys64\``).
+*    Several msys2 packages. Use the ``pacman`` command to install them:
+     ``pacman -S gcc git curl zip unzip zlib-devel``
 
 To build Bazel:
 
-*    Open MSYS2 shell.
-*    Clone bazel git repository as normal.
+*    Open the msys2 shell.
+*    Clone the Bazel git repository as normal.
 *    Set the environment variables:
 
 ```bash
 export JAVA_HOME="$(ls -d C:/Program\ Files/Java/jdk* | sort | tail -n 1)"
 export TMPDIR=c:/temp
-export BAZEL_SH=c:/msys64/usr/bin/bash.exe
+export BAZEL_SH=c:/tools/msys64/usr/bin/bash.exe
 ```
 
 *     Run ``compile.sh`` in Bazel directory.