diff --git a/app.php b/app.php
index 79a6fd7..32e11c0 100644
--- a/app.php
+++ b/app.php
@@ -16,7 +16,7 @@ if($f3->get('PDF_STORAGE_PATH') && !preg_match('|/$|', $f3->get('PDF_STORAGE_PAT
     $f3->set('PDF_STORAGE_PATH', $f3->get('PDF_STORAGE_PATH').'/');
 }
 
-if(!$f3->get('PDF_DEMO_LINK') && $f3->get('PDF_DEMO_LINK') !== false) {
+if($f3->get('PDF_DEMO_LINK') === null || $f3->get('PDF_DEMO_LINK') === true) {
     $f3->set('PDF_DEMO_LINK', 'https://raw.githubusercontent.com/24eme/signaturepdf/master/tests/files/document.pdf');
 }
 
diff --git a/config/config.ini.example b/config/config.ini.example
index 7611cbd..50c6240 100644
--- a/config/config.ini.example
+++ b/config/config.ini.example
@@ -7,7 +7,7 @@ PDF_STORAGE_PATH=/path/to/folder
 ; Disable organization tab and routes
 ;DISABLE_ORGANIZATION=false
 
-; Manage demo link pdf : true (by default, show), false (hide), or custom link
+; Manage demo link pdf : true (by default, show with default link), false (hide), or custom link
 ;PDF_DEMO_LINK=true
 
 ; Metadata default fields