diff --git a/reference/mysqli/persistconns.xml b/reference/mysqli/persistconns.xml
index 58e73ac551..eb8fdd8b91 100644
--- a/reference/mysqli/persistconns.xml
+++ b/reference/mysqli/persistconns.xml
@@ -14,6 +14,12 @@
   connections every time one is required, as unused connections are
   cached and ready to be reused.
  </para>
+ 
+ <para>
+  Unlike the mysql extension, mysqli does not provide a separate function
+  for opening persistent connections. To open a persistent connection you
+  must prepend <literal>p:</literal> to the hostname when connecting.
+ </para>
 
  <para>
   The problem with persistent connections is that they can be left in