diff --git a/reference/array/functions/array-unique.xml b/reference/array/functions/array-unique.xml
index ab0155e457..67a57c4b56 100644
--- a/reference/array/functions/array-unique.xml
+++ b/reference/array/functions/array-unique.xml
@@ -18,11 +18,9 @@
    without duplicate values.
   </para>
   <para>
-   Note that keys are preserved. <function>array_unique</function> sorts
-   the values treated as string at first, then will keep the first key
-   encountered for every value, and ignore all following keys. It does not
-   mean that the key of the first related value from the unsorted
-   <parameter>array</parameter> will be kept.
+   Note that keys are preserved. If multiple elements compare equal under
+   the given <parameter>sort_flags</parameter>, then the key and value of
+   the first equal element will be retained.
   </para>
   <note>
    <simpara>