SI-710 credentials use in yml files
diff --git a/src/main/asciidoc/architectureDocumentation/architectureDocumentation.adoc b/src/main/asciidoc/architectureDocumentation/architectureDocumentation.adoc
index 4ac3df2..199f478 100644
--- a/src/main/asciidoc/architectureDocumentation/architectureDocumentation.adoc
+++ b/src/main/asciidoc/architectureDocumentation/architectureDocumentation.adoc
@@ -746,7 +746,7 @@
First refer to <<#configuration-section-rabbit_mq, RabbitMQ configuration of the backend>>
to setup the RabbitMQ configuration correctly.
-Ein client, that wants to use the message queue to import data, has to use
+A client, that wants to use the message queue to import data, has to use
the correct queue/channel configuration.In addition, the following values must be entered as message headers:
* *metaId* Unique id out of the foreign system.
@@ -844,6 +844,13 @@
* *rabbitmq.routingkey* Routing key for the import queue
* *rabbitmq.exchangename*: Exchange name for the import queue
+_Credentials(Username and Password)_
+
+All credentials in this yml-files are hidden. Environment variables are used to set
+them. Get an environment variable in a yml-file this way `${ENVIRONEMT_VARIABLE}`.
+To successfully run the backend service either set the environment variable for the using platform
+or replace them in the yml-file.
+
=== CI- and CD-Components
==== GIT-Repository
