diff --git a/rsync.yo b/rsync.yo
index 8145687..fe88af2 100644
--- a/rsync.yo
+++ b/rsync.yo
@@ -826,6 +826,13 @@ exists elsewhere in the hierarchy.  This does not affect the accuracy of
 the transfer, just its efficiency.  One way to avoid this is to disable
 incremental recursion using the bf(--no-inc-recursive) option.
 
+When you are updating a non-empty destination or using bf(--link-dest), this
+option ensures only that files that are hard-linked together on the source are
+hard-linked together on the destination; it does NOT break hard links to ensure
+that files that are independent on the source are independent on the
+destination.  Thus, this option is appropriate only for saving space, not when
+you need to exactly duplicate the pattern of hard links on the source.
+
 dit(bf(-p, --perms)) This option causes the receiving rsync to set the
 destination permissions to be the same as the source permissions.  (See
 also the bf(--chmod) option for a way to modify what rsync considers to