diff --git a/reference/array/functions/extract.xml b/reference/array/functions/extract.xml
index b11eed2f33..a17cc089d4 100644
--- a/reference/array/functions/extract.xml
+++ b/reference/array/functions/extract.xml
@@ -9,7 +9,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>int</type><methodname>extract</methodname>
-   <methodparam><type>array</type><parameter>var_array</parameter></methodparam>
+   <methodparam><type>array</type><parameter role="reference">var_array</parameter></methodparam>
    <methodparam choice="opt"><type>int</type><parameter>extract_type</parameter><initializer>EXTR_OVERWRITE</initializer></methodparam>
    <methodparam choice="opt"><type>string</type><parameter>prefix</parameter></methodparam>
   </methodsynopsis>