diff --git a/extensions.ini b/extensions.ini
new file mode 100644
index 0000000..6ec6126
--- /dev/null
+++ b/extensions.ini
@@ -0,0 +1 @@
+extensions = 334,338
diff --git a/gen_pc_sidecar.php b/gen_pc_sidecar.php
index d627eb1..90d146e 100755
--- a/gen_pc_sidecar.php
+++ b/gen_pc_sidecar.php
@@ -22,10 +22,10 @@ function main(): void {
   $argv = $_SERVER['argv'] ?? [];
   $do_notify = in_array('--notify', $argv, true);
 
-  $pbdb = pull_db();
-  $pbdb = trim_db($pbdb);
 
-  $ext_list = ['338', '334'];
+  $pbdb = trim_db(pull_db());
+
+  $ext_list = read_extension_ini();
   $mac_list = pull_mac_list();
 
   foreach ($ext_list as $ext) {
@@ -142,6 +142,13 @@ function pull_mac_list(): array {
   return array_column($mac_db, 'mac', 'ext');
 }
 
+function read_extension_ini(): array {
+  $extensions = parse_ini_file('extensions.ini');
+  $ext_list = array_map('intval', explode(',', $extensions['extensions']));
+
+  return $ext_list;
+}
+
 function pull_xml_file($file): DOMDocument {
   if (!file_exists($file)) {
     $file = '/tftpboot/000000000000-features.cfg';