diff --git a/classes/Module.php b/classes/Module.php
index f33fd5521..fcec05f8d 100644
--- a/classes/Module.php
+++ b/classes/Module.php
@@ -1694,5 +1694,29 @@ abstract class ModuleCore
 		
 		return $result['position'];
 	}
+	
+	/**
+	 * add a warning message to display at the top of the admin page
+	 *
+	 * @param string $msg
+	 */
+	public function adminDisplayWarning($msg)
+	{
+		if (!($this->context->controller instanceof AdminController))
+			return false;
+		$this->context->controller->warnings[] = $msg;
+	}
+
+	/**
+	 * add a info message to display at the top of the admin page
+	 *
+	 * @param string $msg
+	 */
+	protected function adminDisplayInformation($msg)
+	{
+		if (!($this->context->controller instanceof AdminController))
+			return false;
+		$this->context->controller->informations[] = $msg;
+	}
 }
 
diff --git a/modules/homeslider/homeslider.php b/modules/homeslider/homeslider.php
index 0965600ec..00b28ad65 100644
--- a/modules/homeslider/homeslider.php
+++ b/modules/homeslider/homeslider.php
@@ -293,7 +293,7 @@ class HomeSlider extends Module
 			$slide = new HomeSlide((int)Tools::getValue('id_slide'));
 		/* Checks if directory is writable */
 		if (!is_writable('.'))
-			$this->displayWarning(sprintf($this->l('modules %s must be writable (CHMOD 755 / 777)'), $this->name));
+			$this->adminDisplayWarning(sprintf($this->l('modules %s must be writable (CHMOD 755 / 777)'), $this->name));
 
 		/* Gets languages and sets which div requires translations */
 		$defaultLanguage = (int)Configuration::get('PS_LANG_DEFAULT');