diff --git a/doc/Changelog b/doc/Changelog
index 6e42c649b..879301387 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -10,6 +10,7 @@
 	  the example configuration file.
 	- For #519: yacc and lex. And fix python bindings, and test program
 	  unbound-dnstap-socket.
+	- For #519: fix comments for doxygen.
 
 5 August 2021: Wouter
 	- Tag for 1.13.2rc1 release.
diff --git a/libunbound/worker.h b/libunbound/worker.h
index c1fc8e784..f50369f87 100644
--- a/libunbound/worker.h
+++ b/libunbound/worker.h
@@ -62,6 +62,7 @@ struct query_info;
  * @param addrlen: length of addr.
  * @param zone: delegation point name.
  * @param zonelen: length of zone name wireformat dname.
+ * @param tcp_upstream: use TCP for upstream queries.
  * @param ssl_upstream: use SSL for upstream queries.
  * @param tls_auth_name: if ssl_upstream, use this name with TLS
  * 	authentication.
@@ -113,6 +114,7 @@ void worker_sighandler(int sig, void* arg);
  * @param addrlen: length of addr.
  * @param zone: wireformat dname of the zone.
  * @param zonelen: length of zone name.
+ * @param tcp_upstream: use TCP for upstream queries.
  * @param ssl_upstream: use SSL for upstream queries.
  * @param tls_auth_name: if ssl_upstream, use this name with TLS
  * 	authentication.