diff --git a/man8/thin_metadata_size.8 b/man8/thin_metadata_size.8

index 33b36b3..6b00e73 100644

--- a/man8/thin_metadata_size.8

+++ b/man8/thin_metadata_size.8

@@ -1,6 +1,6 @@

 .TH THIN_METADATA_SIZE 8 "Thin Provisioning Tools" "Red Hat, Inc." \" -*- nroff -*-

 .SH NAME

-thin_metadata_size \- thin provisioning metadata file/device size calculator.

+thin_metadata_size \- thin provisioning metadata device/file size calculator.

 .SH SYNOPSIS

 .B thin_metadata_size

@@ -10,13 +10,15 @@ thin_metadata_size \- thin provisioning metadata file/device size calculator.

 .B thin_metadata_size

 calculates the size of the thin provisioning metadata based on the block size

 of the thin provisioned devices, the size of the thin provisioning pool and

-the maximum number of all thin prisioned devices and snapshots. Size/number

-option arguments can be followed by unit specifiers in short one character

-and long form (eg. -b1m or -b1megabytes).

+the maximum number of all thin prisioned devices and snapshots.

+Because thin provisioning pools are holding widely variable contents, 

+this tool is needed to provide sensible initial default size.

 .IP "\fB\-b, \-\-block-size\fP \fIBLOCKSIZE[bskKmMgGtTpPeEzZyY]\fP"

 Block size of thin provisioned devices in units of bytes,sectors,kilobytes,kibibytes,... respectively.

 Default is in sectors without a block size unit specifier.

+Size/number option arguments can be followed by unit specifiers in short one character

+and long form (eg. -b1m or -b1megabytes).

 .IP "\fB\-s, \-\-pool-size\fP \fIPOOLSIZE[bskKmMgGtTpPeEzZyY]\fP"

 Thin provisioning pool size in units of bytes,sectors,kilobytes,kibibytes,... respectively.