diff --git a/usr.sbin/daemon/daemon.8 b/usr.sbin/daemon/daemon.8
index e0f3a0dc11a0..10167a339c0f 100644
--- a/usr.sbin/daemon/daemon.8
+++ b/usr.sbin/daemon/daemon.8
@@ -63,6 +63,11 @@ Change the current working directory to the root
 .It Fl f
 Redirect standard input, standard output and standard error to
 .Pa /dev/null .
+When this option is used together with any of the options related to file
+or syslog output, the standard file descriptors are first redirected to
+.Pa /dev/null ,
+then stdout and/or stderr is redirected to a file or to syslog as
+specified by the other options.
 .It Fl S
 Enable syslog output.
 This is implicitly applied if other syslog parameters are provided.