+Adapter modes
+^^^^^^^^^^^^^
+An event timer adapter can be configured in either periodic or non-periodic mode
+to support timers of the respective type. A periodic timer expires at a fixed
+time interval repeatedly till it is cancelled. A non-periodic timer expires only
+once. The periodic capability flag, ``RTE_EVENT_TIMER_ADAPTER_CAP_PERIODIC``,
+can be set for implementations that support periodic mode if desired. To
+configure an adapter in periodic mode, ``timer_adapter_flags`` of
+``rte_event_timer_adapter_conf`` is set to include the periodic flag
+``RTE_EVENT_TIMER_ADAPTER_F_PERIODIC``. Maximum timeout (``max_tmo_nsec``) does
+not apply to periodic mode.
+