diff --git a/source/administration/sharding.txt b/source/administration/sharding.txt
index 2a940f627d1..9916942b510 100644
--- a/source/administration/sharding.txt
+++ b/source/administration/sharding.txt
@@ -677,9 +677,12 @@ be able to migrate chunks:
       db.settings.update({ _id : "balancer" }, { $set : { activeWindow : { start : "<start-time>", stop : "<stop-time>" } } }, true )
 
    Replace ``<start-time>`` and ``<end-time>`` with time values using
-   two digit hour and minute values (e.g ``HH:MM``) that describe the beginning and end
-   boundaries of the balancing window. For instance, running the following
-   will force the balancer to run between 11PM and 6AM only:
+   two digit hour and minute values (e.g ``HH:MM``) that describe the
+   beginning and end boundaries of the balancing window.
+   These times will be evaluated relative to the time zone of each individual
+   :program:`mongos` instance in the shard cluster.
+   For instance, running the following
+   will force the balancer to run between 11PM and 6AM local time only:
 
    .. code-block:: javascript
 
diff --git a/source/core/sharding-internals.txt b/source/core/sharding-internals.txt
index 597a9f69f59..a2223f8c07e 100644
--- a/source/core/sharding-internals.txt
+++ b/source/core/sharding-internals.txt
@@ -382,6 +382,14 @@ Once a balancing round starts, the balancer will not stop until the
 difference between the number of chunks on any two shards is *less
 than two.*
 
+.. note::
+
+   The balancer can be restricted to operating between specific
+   start and end times, see
+   ":ref:`Schedule the Balancing Window <sharding-schedule-balancing-window>`."
+   These times will be evaluated relative to the time zone of each individual
+   :program:`mongos` instance in the shard cluster.
+
 .. index:: sharding; chunk size
 .. _sharding-chunk-size: