diff --git a/website/source/docs/builders/hyperv-iso.html.md.erb b/website/source/docs/builders/hyperv-iso.html.md.erb
index 9545b44f1..f8d8ddf9b 100644
--- a/website/source/docs/builders/hyperv-iso.html.md.erb
+++ b/website/source/docs/builders/hyperv-iso.html.md.erb
@@ -93,9 +93,9 @@ builder.
     file representing the disk will not use the full size unless it is
     full.
 
--   `disk_block_size` (string) - The block size of the VHD to be created.
+-   `disk_block_size` (string) - The block size of the VHD to be created in MiB.
     Recommended disk block size for Linux hyper-v guests is 1 MiB. This
-    defaults to "32 MiB".
+    defaults to "32" (MiB).
 
 -   `disk_size` (number) - The size, in megabytes, of the hard disk to create
     for the VM. By default, this is 40 GB.