-# The session id is stored on the form and checked to
-# guard against CSRF. But only if the user is logged in,
-# as anonok can allow anonymous edits.
-sub checksessionexpiry ($$) { # {{{
+# To guard against CSRF, the user's session id (sid)
+# can be stored on a form. This function will check
+# (for logged in users) that the sid on the form matches
+# the session id in the cookie.
+sub checksessionexpiry ($$) {
+ my $q=shift;