diff --git a/Documentation/devicetree/bindings/mtd/partition.txt b/Documentation/devicetree/bindings/mtd/partition.txt
index f1e2a02381a4..8dc4bf9dc8e5 100644
--- a/Documentation/devicetree/bindings/mtd/partition.txt
+++ b/Documentation/devicetree/bindings/mtd/partition.txt
@@ -30,6 +30,8 @@ Optional properties:
   partition should only be mounted read-only. This is usually used for flash
   partitions containing early-boot firmware images or data which should not be
   clobbered.
+- lock : Do not unlock the partition at initialization time (not supported on
+  all devices)
 
 Examples: