Signed-off-by: Ivan Khoronzhuk <ivan.khoronz...@linaro.org>
---
 doc/users-guide/users-guide.adoc | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/doc/users-guide/users-guide.adoc b/doc/users-guide/users-guide.adoc
index 7ec7957..d2b5480 100644
--- a/doc/users-guide/users-guide.adoc
+++ b/doc/users-guide/users-guide.adoc
@@ -197,7 +197,7 @@ precise syntax and semantics of each API.
 ODP programs are built around several conceptual structures that every
 application programmer needs to be familiar with to use ODP effectively. The
 main ODP concepts are:
-Thread, Event, Queue, Pool, Shared Memory, Buffer, Packet, PktIO, Timer,
+Thread, Event, Queue, Pool, Shared Memory, Buffer, Packet, PktIO, Time, Timer,
 and Synchronizer.
 
 === Thread
@@ -305,6 +305,19 @@ or may represent a device attached via a PCIE or other bus.
 
 PktIOs are represented by handles of abstract type +odp_pktio_t+.
 
+=== Time
+The time API is used to measure time intervals and track time flow of an
+application and presents presents convenient way to get access to time source.
+The time API consists from two main parts: local time API and global time API.
+The local time API is supposed to be used within one thread and can be faster
+then global time API. The local time API cannot be used between threads as time
+consistency is not guaranteed, and in some cases that's enough. The global time
+API is supposed to be used for tracking time between threads. Both local and
+global time is not wrapped during application life cycle. The time API includes
+functions to operate with time, such as sum, diff, resolution, wait.
+The odp_time_t opaque type represents or local or global timestamp, the
+responsibility is on a user to use time operations with appropriate time type.
+
 === Timer
 Timers are how ODP applications measure and respond to the passage of time.
 Timers are drawn from specialized pools called timer pools that have their
-- 
1.9.1

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