diff --git a/reference/pcre/functions/preg-grep.xml b/reference/pcre/functions/preg-grep.xml
index cf1ec02686..1f533b1fa6 100644
--- a/reference/pcre/functions/preg-grep.xml
+++ b/reference/pcre/functions/preg-grep.xml
@@ -59,7 +59,7 @@
   &reftitle.returnvalues;
   <para>
    Returns an array indexed using the keys from the
-   <parameter>array</parameter> array. 
+   <parameter>array</parameter> array, &return.falseforfailure;.
   </para>
  </refsect1>