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-rw-r--r--doc/manuals/chapters/ussd.adoc4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/manuals/chapters/ussd.adoc b/doc/manuals/chapters/ussd.adoc
index 3ab587f..6100c93 100644
--- a/doc/manuals/chapters/ussd.adoc
+++ b/doc/manuals/chapters/ussd.adoc
@@ -67,7 +67,9 @@ USSD requests internally. It features a set of simple handlers, which
can be assigned to one or more USSD request prefixes:
* `own-msisdn` returns subscriber's MSISDN (if assigned);
-* `own-imsi` returns subscriber's IMSI.
+* `own-imsi` returns subscriber's IMSI;
+* `test-idle` keeps the session idle until the MS terminates it, or
+ the guard timer expires (may be useful for testing).
Additional handlers can be added on request.