improve docs
diff --git a/stack.sh b/stack.sh
index 29f1377..ea4db93 100755
--- a/stack.sh
+++ b/stack.sh
@@ -685,7 +685,9 @@
# Extract ami and aki files
tar -zxf $FILES/$IMAGE_FNAME -C $FILES/images
- # Upload to glance with the glance cli tool.
+ # Use glance client to add the kernel the root filesystem.
+ # We parse the results of the first upload to get the glance ID of the
+ # kernel for use when uploading the root filesystem.
RVAL=`glance add -A $SERVICE_TOKEN name="$IMAGE_NAME-kernel" is_public=true container_format=aki disk_format=aki < $FILES/images/$IMAGE_NAME-vmlinuz*`
KERNEL_ID=`echo $RVAL | cut -d":" -f2 | tr -d " "`
glance add -A $SERVICE_TOKEN name="$IMAGE_NAME" is_public=true container_format=ami disk_format=ami kernel_id=$KERNEL_ID < $FILES/images/$IMAGE_NAME.img