Updated documentation.

doc/snac.8

@@ -251,13 +251,14 @@ From version 2.50, post content can be filtered out by regular expressions.
 These weapons of mass destruction can be written into the
 .Ic filter_reject.txt
 file in the server base directory, one per line; if this file exists,
-all posts' content will be matched against these regexes, one by one, and
-any match will make the post to be rejected. If you don't know about regular
-expressions, don't use this option (or learn about them in some tutorial,
-there are gazillions of them out there), as you and your users may start
-missing posts. Also, given that every regular expression implementation
-supports a different set of features, consider reading the documentation
-about the one implemented in your system.
+all posts' content will be matched (after being stripped of HTML tags)
+against these regexes, one by one, and any match will make the post to
+be rejected. If you don't know about regular expressions, don't use this
+option (or learn about them in some tutorial, there are gazillions of
+them out there), as you and your users may start missing posts. Also,
+given that every regular expression implementation supports a different
+set of features, consider reading the documentation about the one
+implemented in your system.
 .Ss ActivityPub Support
 These are the following activities and objects that
 .Nm