--- a/mercurial/help/config.txt Sat Aug 06 17:04:22 2016 -0700
+++ b/mercurial/help/config.txt Sun Aug 07 18:09:58 2016 -0700
@@ -1557,6 +1557,21 @@
repositories to the exchange format required by the bundle1 data
format can consume a lot of CPU.
+``zliblevel``
+ Integer between ``-1`` and ``9`` that controls the zlib compression level
+ for wire protocol commands that send zlib compressed output (notably the
+ commands that send repository history data).
+
+ The default (``-1``) uses the default zlib compression level, which is
+ likely equivalent to ``6``. ``0`` means no compression. ``9`` means
+ maximum compression.
+
+ Setting this option allows server operators to make trade-offs between
+ bandwidth and CPU used. Lowering the compression lowers CPU utilization
+ but sends more bytes to clients.
+
+ This option only impacts the HTTP server.
+
``smtp``
--------