doc: improve combinelimit description

diff --git a/doc/chrony.conf.adoc b/doc/chrony.conf.adoc
index 7c9218618fd35406fe0b5b2933a9f2f3ed452102..e1fbef3bba2abe06916f8f80b6e5e22715f0e63c 100644 (file)
--- a/doc/chrony.conf.adoc
+++ b/doc/chrony.conf.adoc
@@ -681,6 +681,8 @@ The *combinelimit* directive limits which sources are included in the combining
 algorithm. Their synchronisation distance has to be shorter than the distance
 of the selected source multiplied by the value of the limit. Also, their
 measured frequencies have to be close to the frequency of the selected source.
+If the selected source was specified with the *prefer* option, it can be
+combined only with other sources specified with this option.
 +
 By default, the limit is 3. Setting the limit to 0 effectively disables the
 source combining algorithm and only the selected source will be used to control