diff --git a/docs/activitypub.7 b/docs/activitypub.7
index 69f66b4..aa285a2 100644
--- a/docs/activitypub.7
+++ b/docs/activitypub.7
@@ -139,6 +139,10 @@ and
 Plain text and images in jpeg, gif, png, and webp formats are supported.
 Other formats are linked to origin.
 .El
+.Pp
+The
+.Fa replies
+array will be populated with a list of acknowledged replies.
 .Ss EXTENSIONS
 Honk also supports a
 .Vt Ping