diff --git a/language-snippets.ent b/language-snippets.ent
index b11bdcf119..7394058118 100644
--- a/language-snippets.ent
+++ b/language-snippets.ent
@@ -13,6 +13,10 @@ name of this function, and anything else documented about this
 function may change in a future release of PHP without notice.  Be
 warned and use this function at your own risk.</simpara></warning>'>
 
+<!ENTITY warn.undocumented.func '<warning><simpara>This function is
+currently not documented, only the argument list is
+available.</simpara></warning>'>
+
 <!ENTITY tip.ob-capture '<tip><simpara>As with anything that outputs
 its result directly to the browser, you can use the <link
 linkend="ref.outcontrol">output-control functions</link> to capture