diff --git a/Documentation/card10-cfg.rst b/Documentation/card10-cfg.rst
index d60b4c552ebf3e43ffea33073f5981ba75b531fe..3b3fdf7ab2f25229a314f96734b4cfe613c3abbf 100644
--- a/Documentation/card10-cfg.rst
+++ b/Documentation/card10-cfg.rst
@@ -38,4 +38,6 @@ Supported options
 Option name     Type       Description
 =============== ========== ===========
 ``execute_elf`` Boolean    Allow running of binary :ref:`l0dables`. These files can be nefarious, so this option is off by default.
+--------------- ---------- -----------
+``timezone``    String     Timezone for card10; must be of format ``[+-]HHMM``.  Examples: ``+0800``, ``-0200``
 =============== ========== ===========