diff --git a/docs/formatnwfilter.html.in b/docs/formatnwfilter.html.in
index 31f105e671c9ef88d160ec398a2a2d9c25c6467e..8840856b00d319473c291f34f244e7523992e76c 100644
--- a/docs/formatnwfilter.html.in
+++ b/docs/formatnwfilter.html.in
@@ -261,7 +261,7 @@
     <ul>
      <li>
         action -- mandatory; must either be <code>drop</code>,
-        <code>reject</code><span class="since">(since 0.8.9)</span>,
+        <code>reject</code><span class="since">(since 0.9.0)</span>,
         or <code>accept</code> if
         the evaluation of the filtering rule is supposed to drop,
         reject (using ICMP message), or accept a packet