doc: add Sim Toolkit overview

diff --git a/doc/overview.txt b/doc/overview.txt
index e12427f..2a30e0b 100644 (file)
--- a/doc/overview.txt
+++ b/doc/overview.txt
@@ -130,6 +130,14 @@ Current implemented features:
                enabling and disabling fast dormancy on hardware that support
                this feature.
 
+       Sim Toolkit
+
+               The Sim Toolkit interface handles the SAT commands. Sim Toolkit
+               relies on the SimToolkit agent not only to get confirmation
+               from the user but also to inform user of the SAT initiated
+               operation status. Information on the Sim Toolkit feature
+               list can be found in features.txt.
+
 Work in progress features:
 
        USSD