diff --git a/hosts/yodaYoga/host-specific.nix b/hosts/yodaYoga/host-specific.nix
index f715857..ad0c5fa 100644
--- a/hosts/yodaYoga/host-specific.nix
+++ b/hosts/yodaYoga/host-specific.nix
@@ -5,7 +5,8 @@
   home-manager.users.yoda = { osConfig, config, pkgs, ... }: {
     home.file."readonly-git/BikeTripPlanner".source = (builtins.fetchGit {
       url = "https://github.com/langbein-daniel/BikeTripPlanner";
-      #leaveDotGit = true;
+      #rev = "6d4daf18235189825b0c314901b1617ece6d8641";
+      #submodules = true;
     });
   };
 
diff --git a/modules/base.nix b/modules/base.nix
index 0e70404..3258c60 100644
--- a/modules/base.nix
+++ b/modules/base.nix
@@ -83,6 +83,7 @@
     # The `--delete-older-than <period` option refers the manual for `nix-env --delete-generations <period>`: https://nixos.org/manual/nix/stable/command-ref/nix-env/delete-generations#generations-time
     # There, two meanings of <period> are described. The second one is:
     #   +<number>: Keep the last number generations, along with any newer than current.
+    # TODO: +7 does currently not work. There is an open issue: https://github.com/NixOS/nixpkgs/issues/282884
     options = "--delete-older-than +7";
   };