[OE-core] [wic][PATCH] wic: Document creation of empty partition

[Ed Bartosh]

Added short explanation of how to create empty pattition
to the 'wic help kickstart' command output.

Signed-off-by: Ed Bartosh <ed.bartosh at linux.intel.com>
---
 scripts/lib/image/help.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/lib/image/help.py b/scripts/lib/image/help.py
index 14f0ff1..adfe976 100644
--- a/scripts/lib/image/help.py
+++ b/scripts/lib/image/help.py
@@ -707,6 +707,10 @@ DESCRIPTION
                    up being are dependent on the given plugin
                    implementation.
 
+                   If --source option is not used, the wic command
+                   will create empty partition. --size parameter has
+                   to be used to specify size of empty partition.
+
          --ondisk or --ondrive: Forces the partition to be created on
                                 a particular disk.
 
-- 
2.1.4