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-rw-r--r--Documentation/device-mapper/cache.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt
index af99c458c841..33d45ee0b737 100644
--- a/Documentation/device-mapper/cache.txt
+++ b/Documentation/device-mapper/cache.txt
@@ -58,7 +58,8 @@ Fixed block size
The origin is divided up into blocks of a fixed size. This block size
is configurable when you first create the cache. Typically we've been
-using block sizes of 256k - 1024k.
+using block sizes of 256KB - 1024KB. The block size must be between 64
+(32KB) and 2097152 (1GB) and a multiple of 64 (32KB).
Having a fixed block size simplifies the target a lot. But it is
something of a compromise. For instance, a small part of a block may be