diff --git a/lib/App/Netdisco/DB/Result/Virtual/PortUtilization.pm b/lib/App/Netdisco/DB/Result/Virtual/PortUtilization.pm
index c822c114..a51e6ccc 100644
--- a/lib/App/Netdisco/DB/Result/Virtual/PortUtilization.pm
+++ b/lib/App/Netdisco/DB/Result/Virtual/PortUtilization.pm
@@ -7,6 +7,7 @@ use base 'DBIx::Class::Core';
 
 __PACKAGE__->table_class('DBIx::Class::ResultSource::View');
 
+# NOTE this query is in `git grep 'THREE PLACES'`
 __PACKAGE__->table('port_utilization');
 __PACKAGE__->result_source_instance->is_virtual(1);
 __PACKAGE__->result_source_instance->view_definition(<<ENDSQL
diff --git a/lib/App/Netdisco/DB/ResultSet/DevicePort.pm b/lib/App/Netdisco/DB/ResultSet/DevicePort.pm
index 636ef569..30afb730 100644
--- a/lib/App/Netdisco/DB/ResultSet/DevicePort.pm
+++ b/lib/App/Netdisco/DB/ResultSet/DevicePort.pm
@@ -67,6 +67,7 @@ sub with_is_free {
     ->search({},
       {
         '+columns' => { is_free =>
+          # NOTE this query is in `git grep 'THREE PLACES'`
           \["me.up_admin = 'up' AND me.up != 'up' AND me.type != 'propVirtual' AND "
               ."((age(now(), to_timestamp(extract(epoch from device.last_discover) - (device.uptime/100))) < ?::interval "
               ."AND (last_node.time_last IS NULL OR age(now(), last_node.time_last) > ?::interval)) "
@@ -96,6 +97,7 @@ sub only_free_ports {
     ->search_rs($cond, $attrs)
     ->search(
       {
+        # NOTE this query is in `git grep 'THREE PLACES'`
         'me.up_admin' => 'up',
         'me.up'       => { '!=' => 'up' },
         'me.type'     => { '!=' => 'propVirtual' },
diff --git a/lib/App/Netdisco/Web/Plugin/Device/Ports.pm b/lib/App/Netdisco/Web/Plugin/Device/Ports.pm
index 9f994dcd..d4850b5b 100644
--- a/lib/App/Netdisco/Web/Plugin/Device/Ports.pm
+++ b/lib/App/Netdisco/Web/Plugin/Device/Ports.pm
@@ -82,6 +82,7 @@ get '/ajax/content/device/ports' => require_login sub {
             });
         }
         delete $port_state{free};
+        # showing free ports requires showing down ports
         ++$port_state{down};
     }