diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index 299fd4753e5..1b290222a11 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -418,7 +418,7 @@ abstract class CommonDocGenerator
      *	@param  Object			$object				Object with extrafields (must have $object->array_options filled)
      *	@param  array			$array_to_fill      Substitution array
      *  @param  Extrafields		$extrafields        Extrafields object
-     *  @param   array_key		$array_key	        Name of the key for return array
+     *  @param  string			$array_key	        Name of the key for return array
      *  @param  Translate		$outputlangs        Lang object to use for output
      *	@return	array								Substitution array
      */