diff --git a/plugins/disk/raid b/plugins/disk/raid
index f3ff22df..2bf7a1de 100755
--- a/plugins/disk/raid
+++ b/plugins/disk/raid
@@ -35,10 +35,12 @@ my(@text) = <$mdstat>;
 close($mdstat);
 
 my($devinfo_re, $devstat_re, $action_re) = (
-    '(md\d+)\s+:\s+active\s+(\(auto-read-only\)\s+|)(\w+)\s+(.*)',
+    '(md\d+)\s+:\s+active\s+(\(read-only\)\s+|\(auto-read-only\)\s+|)(\w+)\s+(.*)',
     '.*\[(\d+)\/(\d+)]\s+\[(\w+)]',
     '(.*(check|resync)\s=\s+(\d+\.\d+)%)',
 );
+# Interestingly, swap is presented as "active (auto-read-only)"
+# and mdadm has '--readonly' option to make the array 'active (read-only)'
 
 my($dev, $type, $members, $nmem, $nact, $status, $proc);
 while (@text) {