diff --git a/tester/flexisip/README b/tester/flexisip/README
index b2799db77..c4dce60b8 100644
--- a/tester/flexisip/README
+++ b/tester/flexisip/README
@@ -1,3 +1,5 @@
 flexisip.conf : is the configuration of the flexisip running on sip2.linphone.org. It has lots of IP addresses hardcoded because this machine is running multiple instances on different IP addresses.
 flexisip-generic.conf : is the same configuration without any IP address hardcoded and relative paths. It can be run on any machine from the "tester" directory of linphone.
 
+Make sure that any changes performed on one of these two files is also made on the other.
+
diff --git a/tester/flexisip/flexisip-generic.conf b/tester/flexisip/flexisip-generic.conf
index 2795738cd..a25e61166 100644
--- a/tester/flexisip/flexisip-generic.conf
+++ b/tester/flexisip/flexisip-generic.conf
@@ -115,6 +115,9 @@ filter= from.uri.domain contains 'sip.example.org' || from.uri.domain contains '
 #  Default value: 
 auth-domains= sip.example.org auth.example.org auth1.example.org auth2.example.org
 
+#regexp for test "TLS authentication - client rejected due to unmatched certificate subject" of Flexisip test suite.
+tls-client-certificate-required-subject=galadrielle|sip:sip.example.org
+
 
 
 # List of whitespace separated IP which will not be challenged.
diff --git a/tester/flexisip/flexisip.conf b/tester/flexisip/flexisip.conf
index 682f3180b..e5b800fe2 100644
--- a/tester/flexisip/flexisip.conf
+++ b/tester/flexisip/flexisip.conf
@@ -115,6 +115,8 @@ filter= from.uri.domain contains 'sip.example.org' || from.uri.domain contains '
 #  Default value: 
 auth-domains= sip.example.org auth.example.org auth1.example.org auth2.example.org
 
+#regexp for test "TLS authentication - client rejected due to unmatched certificate subject" of Flexisip test suite.
+tls-client-certificate-required-subject=galadrielle|sip:sip.example.org
 
 
 # List of whitespace separated IP which will not be challenged.