diff --git a/tests/FILEFORMAT b/tests/FILEFORMAT
index 3098fba78..d52474bec 100644
--- a/tests/FILEFORMAT
+++ b/tests/FILEFORMAT
@@ -18,6 +18,10 @@ the subsections currently supported.
 data to sent to the client on its request and later verified that it arrived
 safely. Set the nocheck=1 to prevent the test script to verify the arrival
 of this data.
+
+If the data contains 'swsclose' *anywhere* within the start and end tag, and
+this is a HTTP test, then the connection will be closed by the server after
+this response is sent. If not, the connection will be kept persistant.
 </data>
 <dataNUM>
 Send back this contents instead of the <data> one. The num is set by: