diff --git a/reference/info/functions/putenv.xml b/reference/info/functions/putenv.xml
index 81f416e81e..888f707558 100644
--- a/reference/info/functions/putenv.xml
+++ b/reference/info/functions/putenv.xml
@@ -80,8 +80,10 @@ putenv("UNIQID=$uniqid");
   &reftitle.notes;
   <warning>
    <para>
-    These directives have only effect when <link
-    linkend="features.safe-mode">safe-mode</link> itself is enabled!
+    The <literal>safe_mode_allowed_env_vars</literal> and
+    <literal>safe_mode_protected_env_vars</literal> directives only take
+    effect when <link linkend="features.safe-mode">safe_mode</link> is
+    enabled.
    </para>
   </warning>
  </refsect1>