diff --git a/htdocs/core/class/doleditor.class.php b/htdocs/core/class/doleditor.class.php
index 8f2c9faf506..030713957a3 100644
--- a/htdocs/core/class/doleditor.class.php
+++ b/htdocs/core/class/doleditor.class.php
@@ -44,7 +44,7 @@ class DolEditor
 
 	// If not using fckeditor
 	/**
-	 * @var string
+	 * @var ?string
 	 */
 	public $content;
 	/**