diff --git a/reference/array/functions/array-unique.xml b/reference/array/functions/array-unique.xml
index c0c50c2985..2ada390930 100644
--- a/reference/array/functions/array-unique.xml
+++ b/reference/array/functions/array-unique.xml
@@ -117,8 +117,8 @@
        <entry>5.2.9</entry>
        <entry>
         Added the optional <parameter>sort_flags</parameter> defaulting
-        to SORT_REGULAR. Prior to 5.2.9, this function used to sort
-        the array with SORT_STRING internally.
+        to <constant>SORT_REGULAR</constant>. Prior to 5.2.9, this function used to sort
+        the array with <constant>SORT_STRING</constant> internally.
        </entry>
       </row>
      </tbody>