diff --git a/docs/activitypub.7 b/docs/activitypub.7
index caf66f6..ba92a8a 100644
--- a/docs/activitypub.7
+++ b/docs/activitypub.7
@@ -64,8 +64,10 @@ The following tags are supported.
 .Bd -literal -offset indent
 a, img, span,
 div, h1, h2, h3, h4, h5, h6, hr,
-table, thead, tbody, th, tr, td, colgroup, col,
+table, thead, tbody, tfoot, th, tr, td, colgroup, col,
 p, br, pre, code, blockquote, q,
+caption, kbd, time, wbr, aside,
+ruby, rtc, rb, rt, details, summary,
 samp, mark, ins, dfn, cite, abbr, address,
 strong, em, b, i, s, u, sub, sup, del, tt, small,
 ol, ul, li, dl, dt, dd