diff --git a/libisoburn/trunk/releng/README b/libisoburn/trunk/releng/README
index dfcc60ef..2d3054d1 100644
--- a/libisoburn/trunk/releng/README
+++ b/libisoburn/trunk/releng/README
@@ -122,8 +122,8 @@ the user or require sysadmin considerations before they are run:
 
 ./manual_isojigdo -x ../xorriso/xorriso
   Exercises the production of a bootable Debian GNU/Linux image and its Jigdo
-  files. This test downloads a Debian daily image for i386 of about 70 MB,
-  extracts its content and composes a new image. Thus it needs about 250 MB
+  files. This test downloads a Debian daily image for i386 of about 270 MB,
+  extracts its content and composes a new image. Thus it needs about 850 MB
   of disk space in releng/releng_generated_data.
   This test will only work with GNU xorriso or if libjte was installed already
   when libisofs was built. Further it needs the program jigit-mkimage. Both