diff --git a/reference/array/functions/array-merge.xml b/reference/array/functions/array-merge.xml
index 8295fbf60f..5768dad253 100644
--- a/reference/array/functions/array-merge.xml
+++ b/reference/array/functions/array-merge.xml
@@ -26,8 +26,8 @@
    appended.
   </para>
   <para>
-   If only one array is given and the array is numerically indexed, the
-   keys get reindexed in a continuous way.
+   If all of the arrays contain only numeric keys, the resulting array
+   is given incrementing keys starting from zero.
   </para>
  </refsect1>
  <refsect1 role="parameters">