diff --git a/testsite/tls/templates/phpinfo.example.com_https.cfg b/testsite/tls/templates/phpinfo.example.com_https.cfg
index 6815c7a1d1ae1432b000fd4c91587fb6fe4e040c..269d4850252c45804165f54b7e39641bbdcba6c9 100644
--- a/testsite/tls/templates/phpinfo.example.com_https.cfg
+++ b/testsite/tls/templates/phpinfo.example.com_https.cfg
@@ -25,3 +25,8 @@ tls_www_server
 # Whether this certificate will be used to sign data (needed
 # in TLS DHE ciphersuites).
 signing_key
+
+# Whether this certificate will be used to encrypt data (needed
+# in TLS RSA ciphersuites). Note that it is preferred to use different
+# keys for encryption and signing.
+encryption_key