diff --git a/app/admin/forms.py b/app/admin/forms.py
index c8a4c503..62cf3105 100644
--- a/app/admin/forms.py
+++ b/app/admin/forms.py
@@ -81,7 +81,7 @@ class EditCommunityForm(FlaskForm):
                ('masonry', _l('Masonry')),
                ('masonry_wide', _l('Wide masonry'))]
     default_layout = SelectField(_l('Layout'), coerce=str, choices=layouts, validators=[Optional()])
-    posting_warning = StringField(_('Posting warning'))
+    posting_warning = StringField(_('Posting warning'), validators=[Optional(), Length(min=3, max=512)])
     submit = SubmitField(_l('Save'))
 
     def validate(self, extra_validators=None):
diff --git a/app/templates/base.html b/app/templates/base.html
index 37a58779..3f93f2d4 100644
--- a/app/templates/base.html
+++ b/app/templates/base.html
@@ -244,8 +244,9 @@
             {% else %}
                 <p class="text-center mt-4"><a href="https://liberapay.com/PieFed/donate">Donate with Liberapay</a></p>
             {% endif %}
-            <p class="text-center"><a href="/keyboard_shortcuts">{{ _('Keyboard shortcuts') }}</a></p>
             <p class="text-center"><a href="https://patreon.com/PieFed">Donate with Patreon</a></p>
+            <p class="text-center"><a href="/about">{{ _('About') }}</a></p>
+            <p class="text-center"><a href="/keyboard_shortcuts">{{ _('Keyboard shortcuts') }}</a></p>
             <p class="text-center"><a href="https://codeberg.org/rimu/pyfedi">PieFed is free and open source</a>.<br />Please <a href="https://codeberg.org/rimu/pyfedi/issues">report bugs</a> or <a href="https://join.piefed.social/get-involved/">get involved</a>.</p>
             <p class="text-center"><a href="/privacy">Privacy policy</a></p>
         </footer>
diff --git a/app/templates/robots.txt b/app/templates/robots.txt
index 47d45da5..28da817a 100644
--- a/app/templates/robots.txt
+++ b/app/templates/robots.txt
@@ -27,3 +27,7 @@ Disallow: /
 
 User-agent: SeznamBot
 Disallow: /
+
+User-agent: DataForSeoBot
+Disallow: /
+