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diff --git a/docs/README.bootparams b/docs/README.bootparams
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@@ -44,6 +44,9 @@ INDEX
The argument is an integer and optional unit.
Units are M,G (powers of 1024).
Default: "256M"
+* cow_chunksize= Set chunksize used for dm-snapshot. This is number
+ of 512 byte blocks to write at once.
+ Default: "8"
* copytoram_size= Set the size of tmpfs. This space is used for
airootfs.sfs image if copytoram=y.
Size is in bytes (suffix with "k", "m" and "g") or