diff --git a/doc/manual/config-advanced.rst b/doc/manual/config-advanced.rst
index e28010d3b0..6c9f5feee8 100644
--- a/doc/manual/config-advanced.rst
+++ b/doc/manual/config-advanced.rst
@@ -338,8 +338,11 @@ systemd, then edit the ``domjudge-judgehost.target`` unit file and add
 more judgedaemons there.
 
 Although each judgedaemon process will be bound to one single CPU
-core, shared use of other resources such as disk I/O might
-still have effect on run times.
+core, shared use of other resources such as disk I/O typically
+still has an effect on run times.
+Therefore we recommend running a single judgedaemon per physical
+machine for contests where precise timing is important.
+
 
 Multi-site contests
 -------------------
diff --git a/doc/manual/install-judgehost.rst b/doc/manual/install-judgehost.rst
index f180b373da..6010cdf608 100644
--- a/doc/manual/install-judgehost.rst
+++ b/doc/manual/install-judgehost.rst
@@ -19,6 +19,8 @@ System requirements
 * A TCP/IP network which connects the DOMserver and the judgehosts.
   The machines only need HTTP(S) access to the DOMserver.
 
+We recommend running a single judgedaemon per physical machine.
+For more details see the section :ref:`multiple-judgedaemons`.
 
 .. _judgehost_software: