diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index b05a108545d..3c71326ab52 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -1187,12 +1187,12 @@ abstract class CommonDocGenerator
 	 *	Fill array with couple extrafield key => extrafield value
 	 *  Note that vars into substitutions array are formatted.
 	 *
-	 *	@param  CommonObject					$object				Object with extrafields (must have $object->array_options filled)
-	 *	@param  array<string,int|float|string>	$array_to_fill      Substitution array
-	 *  @param  ExtraFields						$extrafields        ExtraFields object
-	 *  @param  string							$array_key	        Prefix for name of the keys into returned array
-	 *  @param  Translate						$outputlangs        Lang object to use for output
-	 *	@return	array<string,float|string>							Substitution array
+	 *	@param  CommonObject						$object				Object with extrafields (must have $object->array_options filled)
+	 *	@param  array<string,?int|?float|?string>	$array_to_fill      Substitution array
+	 *  @param  ExtraFields							$extrafields        ExtraFields object
+	 *  @param  string								$array_key	        Prefix for name of the keys into returned array
+	 *  @param  Translate							$outputlangs        Lang object to use for output
+	 *	@return	array<string,float|string>								Substitution array
 	 */
 	public function fill_substitutionarray_with_extrafields($object, $array_to_fill, $extrafields, $array_key, $outputlangs)
 	{