diff --git a/pkgs/development/libraries/gdk-pixbuf/default.nix b/pkgs/development/libraries/gdk-pixbuf/default.nix
index 626fb2627b33..ca0b773ed286 100644
--- a/pkgs/development/libraries/gdk-pixbuf/default.nix
+++ b/pkgs/development/libraries/gdk-pixbuf/default.nix
@@ -33,7 +33,7 @@ stdenv.mkDerivation rec {
   # The tests take an excessive amount of time (> 1.5 hours) and memory (> 6 GB).
   inherit (doCheck);
 
-  # propagate the bin output
+  # propagate the bin output TODO: use propagatedOutputs instead
   postPhases = "postPostFixup";
   postPostFixup = ''
     echo -n " $bin" >> "$dev"/nix-support/propagated-*build-inputs
diff --git a/pkgs/misc/cups/default.nix b/pkgs/misc/cups/default.nix
index 82fe6299a727..aa63fdaebc5e 100644
--- a/pkgs/misc/cups/default.nix
+++ b/pkgs/misc/cups/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation {
   };
 
   # FIXME: the cups libraries contains some $out/share strings so can't be split.
-  outputs = [ "dev" "out" "doc" "man" ];
+  outputs = [ "dev" "out" "doc" "man" ]; # TODO: above
 
   buildInputs = [ pkgconfig zlib libjpeg libpng libtiff libusb gnutls avahi libpaper ]
     ++ optionals stdenv.isLinux [ pam dbus.libs acl ];