diff --git a/releng/releng_build_isojigdo b/releng/releng_build_isojigdo
index 15f9813f..86da7878 100755
--- a/releng/releng_build_isojigdo
+++ b/releng/releng_build_isojigdo
@@ -132,7 +132,7 @@ jigit-mkimage \
    -m Debian=${DIR} \
    -o ${IMG}.new
 
-# diff'em
+# diff'em TODO: trap the exit code of diff and let the Universe explode
 diff ${IMG}.iso ${IMG}.new
 
 # sort out the cruft