Update documentation

Signed-off-by: Bartosz Gardziejewski <bartosz.gardziejewski@nokia.com>
Change-Id: I02423be3ab22d2c5e6772ca4336d30179ce9663c
Issue-ID: DCAEGEN2-2630

diff --git a/docs/sections/sdk/architecture.rst b/docs/sections/sdk/architecture.rst
index 3a5cf64..dd74e05 100644 (file)
--- a/docs/sections/sdk/architecture.rst
+++ b/docs/sections/sdk/architecture.rst
@@ -65,6 +65,21 @@ As noted above a reactive stream (Flux/Mono) terminates on first exception in an
                 .map(resp -> ...);
     }
 
+Environment substitution
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+CBS-client have ability to insert environment variables into loaded application configuration.
+Environment variables in configuration file must be in format `${ENV_NAME}` example:
+
+.. code-block:: yaml
+
+    streams_publishes:
+      perf3gpp:
+        testArray:
+          - testPrimitiveArray:
+              - "${AAF_USER}"
+              - "${AAF_PASSWORD}"
+
 Libraries
 ~~~~~~~~~~