diff --git a/lib/modules.nix b/lib/modules.nix
index 137dde71..e715116b 100644
--- a/lib/modules.nix
+++ b/lib/modules.nix
@@ -1,6 +1,7 @@
 { inputs, pkgs, lib, ... }:
 
 rec {
+  # Conveniance wrapper for mkOption with boolean type
   mkBoolOpt = def: desc:
   lib.mkOption {
     type = lib.types.bool;
@@ -8,9 +9,11 @@ rec {
     description = desc;
   };
 
+  # Like mkIf but the predicate is inverted
   mkElse = pred: do:
   (lib.mkIf (!pred) do);
 
+  # Creates a symlink if it doesn't exist
   mkLink = src: dest:
   ''
     if [ ! -L "${dest}" ]; then
@@ -18,10 +21,31 @@ rec {
     fi
   '';
 
+  # Removes a symlink if it exists
   mkUnlink = dest:
   ''
     if [ -L "${dest}" ]; then
       rm ${dest}
     fi
   '';
+
+  # TODO
+  mkMultiOptStr = {  }:
+  {
+
+  };
+
+  # TODO
+  mkMultiOptPkg = { }:
+  {
+
+  };
+
+  # Returns true if base contains element
+  contains = base: element:
+  lib.any (x: x == element) base;
+
+  # Returns base without occurences of elements that are also in remove
+  without = base: remove:
+  lib.filter (x: !(contains remove x)) base;
 }