Document the use of filter_text => 0

README.md

@@ -61,7 +61,6 @@ tests locally:
 
 ## TODOs
 
-- Figure out why `filter_text` is set to `0` and document that?
 - Stop working on this and start the imageboard
 
 ## AGPL-3.0+ANTIFA compliance

lib/PostText.pm

@@ -30,6 +30,8 @@ sub startup($self) {
 
     $self->helper(hr => sub ($c) {
         state $hr = HTML::Restrict->new(
+            # filter_text breaks greater and less than symbols in Markdown code blocks
+            # Also breaks Markdown quote blocks
             filter_text            => 0,
             strip_enclosed_content => [],
             rules                  => {