diff --git a/ttrss/mk-normalize-headers.nix b/ttrss/mk-normalize-headers.nix
index b9852e5..81d3f20 100644
--- a/ttrss/mk-normalize-headers.nix
+++ b/ttrss/mk-normalize-headers.nix
@@ -3,12 +3,15 @@
 { name
 , configDir ? "/etc/php"
 , configFile ? "normalize-headers.php"
+
+, debug ? false
 }:
 rec {
   inherit name configDir configFile;
 
   pkg = TtrssPHPNormalizeHeaders {
     inherit configDir configFile;
+    inherit debug;
   };
   type = "fileset";
 }
diff --git a/ttrss/normalize-headers.nix b/ttrss/normalize-headers.nix
index ca5e449..c6fe112 100644
--- a/ttrss/normalize-headers.nix
+++ b/ttrss/normalize-headers.nix
@@ -4,6 +4,8 @@
 }:
 { configDir ? "/etc/php"
 , configFile ? "normalize-headers.php"
+
+, debug ? false
 }:
 
 utils.mkConfigFile {
@@ -47,8 +49,7 @@ utils.mkConfigFile {
     }
   
   }
-
-  # trigger_error(print_r($_SERVER, true), E_USER_WARNING);
-  
-  '';
+  '' + (if !debug then "" else ''
+  trigger_error(print_r($_SERVER, true), E_USER_WARNING);
+  '');
 }