diff --git a/createhdds.py b/createhdds.py
index 5c9290b..c727ffc 100755
--- a/createhdds.py
+++ b/createhdds.py
@@ -43,6 +43,11 @@ from six.moves.urllib.request import urlopen
 # directory.
 SCRIPTDIR = os.path.abspath(os.path.dirname(sys.argv[0]))
 CPUARCH = platform.processor()
+# Some processors or platforms return an empty string in
+# previous step and the script then ends with an error
+# saying "Won't create X image on  host."
+# If that happens, let's read the value from the
+# platform.machine() instead.
 if not CPUARCH:
     CPUARCH = platform.machine()
 logger = logging.getLogger('createhdds')
@@ -157,7 +162,7 @@ class GuestfsImage(object):
                 gpt_type = part.get("gpt_type", None)
                 if gpt_type:
                     gfs.part_set_gpt_type(disk, partnum, gpt_type)
-                # format the partition    
+                # format the partition
                 gfs.mkfs(part['filesystem'], partname, label=part.get('label'))
             # do file 'writes' (create a file with a given string as
             # its content)
@@ -308,7 +313,7 @@ class VirtInstallImage(object):
         # build Workstation images out of Everything
         if variant == 'Workstation':
             variant = 'Everything'
-        
+
         try:
             # this is almost complex enough to need fedfind but not
             # quite, I think. also fedfind can't find the 'transient'