diff --git a/usr/lib/permission-hardener.d/25_default_whitelist_qubes.conf b/usr/lib/permission-hardener.d/25_default_whitelist_qubes.conf
index 4fefe4f..40f9b59 100644
--- a/usr/lib/permission-hardener.d/25_default_whitelist_qubes.conf
+++ b/usr/lib/permission-hardener.d/25_default_whitelist_qubes.conf
@@ -12,10 +12,13 @@
 ## qfile-unpacker allows unprivileged users in VMs to gain root privileges
 ## https://github.com/QubesOS/qubes-issues/issues/8633
 ##
-## match both:
+## matches both:
 ## - /usr/lib/qubes/qfile-unpacker whitelist
 ##   - Not bit-for-bit identical to /usr/lib/qubes/qfile-unpacker.
 ##   - Stripping SUID from this does *not* break file copying.
 ##   - TODO: further reserach required on its purpose
 ## - /usr/bin/qfile-unpacker
+##   - Appears to be an integral part of file transfer between qubes, stripping
+##     SUID from this in an AppVM results in that AppVM being unable to receive
+##     files any longer. (It can still send files to other qubes though.)
 qfile-unpacker matchwhitelist