diff --git a/language/functions.xml b/language/functions.xml
index ee18bcda41..70a8e5e184 100644
--- a/language/functions.xml
+++ b/language/functions.xml
@@ -1374,7 +1374,7 @@ $greet('PHP');
    <simpara>
     Closures may also inherit variables from the parent scope. Any such
     variables must be passed to the <literal>use</literal> language construct.
-    From PHP 7.1, these variables may not include &link.superglobals;,
+    From PHP 7.1, these variables must not include &link.superglobals;,
     <varname>$this</varname>, or variables with the same name as a parameter.
    </simpara>