diff --git a/mdadm.8.in b/mdadm.8.in
index a3494a1..9e7cb96 100644
--- a/mdadm.8.in
+++ b/mdadm.8.in
@@ -2878,7 +2878,7 @@ operation, as described below under LAYOUT CHANGES.
 
 .SS CHUNK-SIZE AND LAYOUT CHANGES
 
-Changing the chunk-size of layout without also changing the number of
+Changing the chunk-size or layout without also changing the number of
 devices as the same time will involve re-writing all blocks in-place.
 To ensure against data loss in the case of a crash, a
 .B --backup-file