diff --git a/flake.nix b/flake.nix
index c3b1340..b8237df 100644
--- a/flake.nix
+++ b/flake.nix
@@ -187,6 +187,12 @@
       append = new: orig: here: orig ++ (list any new);
       # ------
 
+      # ------
+      # combine
+      # ------
+      combine = first: second: orig: here: (function second) ((function first) orig here) orig here;
+      # ------
+
       # ------
       # update
       # ------