diff --git a/app/post/routes.py b/app/post/routes.py
index 685567d9..dee6a2b9 100644
--- a/app/post/routes.py
+++ b/app/post/routes.py
@@ -423,6 +423,7 @@ def continue_discussion(post_id, comment_id):
 @bp.route('/post/<int:post_id>/comment/<int:comment_id>/reply', methods=['GET', 'POST'])
 @login_required
 def add_reply(post_id: int, comment_id: int):
+    # this route is used when JS is disabled
     if current_user.banned or current_user.ban_comments:
         return show_ban_message()
     post = Post.query.get_or_404(post_id)
@@ -477,6 +478,8 @@ def add_reply(post_id: int, comment_id: int):
 @bp.route('/post/<int:post_id>/comment/<int:comment_id>/reply_inline', methods=['GET', 'POST'])
 @login_required
 def add_reply_inline(post_id: int, comment_id: int):
+    # this route is called by htmx and returns a html fragment representing a form that can be submitted to make a new reply
+    # it also accepts the POST from that form and makes the reply
     if current_user.banned or current_user.ban_comments:
         return _('You have been banned.')
     post = Post.query.get_or_404(post_id)
diff --git a/app/templates/post/add_reply_inline_result.html b/app/templates/post/add_reply_inline_result.html
index d699c91f..9b45d234 100644
--- a/app/templates/post/add_reply_inline_result.html
+++ b/app/templates/post/add_reply_inline_result.html
@@ -1,5 +1,8 @@
 {# This file is similar to _post_reply_teaser.html except it includes the render_username macro and removes
-   a few things that aren't needed on brand new comments #}
+   a few things that aren't needed on brand new comments.
+   We need to include that macro because this template is used as part of a full page (it's an ajax response) so
+   it does not inherit from base.html where the macro is normally defined.
+#}
 {% macro render_username(user, add_domain=True, htmx_redirect_back_to=None) -%}
 <span class="render_username">
     {% if user.deleted -%}