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-rw-r--r--system/doc/design_principles/applications.xml10
1 files changed, 7 insertions, 3 deletions
diff --git a/system/doc/design_principles/applications.xml b/system/doc/design_principles/applications.xml
index c673fde07e..6e5a2ce6cf 100644
--- a/system/doc/design_principles/applications.xml
+++ b/system/doc/design_principles/applications.xml
@@ -363,9 +363,13 @@ ok
application are running.</p>
<marker id="application_master"></marker>
<p>The application controller then creates an
- <em>application master</em> for the application. The application master
- is the group leader of all the processes in the application.
- The application master starts the application by calling
+ <em>application master</em> for the application. The application
+ master becomes the group leader of all the processes in the
+ application. I/O is forwarded to the previous group leader,
+ though, this is just a way to identify processes that belong to
+ the application. Used for example to find itself from any process,
+ or, reciprocally, to kill them all when it terminates.</p>
+ <p>The application master starts the application by calling
the application callback function <c>start/2</c> in the module,
and with the start argument, defined by the <c>mod</c> key in
the <c>.app</c> file.</p>