diff --git a/build_library/vm_image_util.sh b/build_library/vm_image_util.sh
index cb8bff0bc9..a27e7a249b 100644
--- a/build_library/vm_image_util.sh
+++ b/build_library/vm_image_util.sh
@@ -130,7 +130,7 @@ IMG_pxe_DISK_FORMAT=cpio
 IMG_pxe_PARTITIONED_IMG=0
 IMG_pxe_CONF_FORMAT=pxe
 
-## pxe, which is an cpio image
+## iso, which is an cpio image
 IMG_iso_DISK_FORMAT=iso
 IMG_iso_PARTITIONED_IMG=0
 IMG_iso_CONF_FORMAT=iso