...There's a merge operator for that
diff --git a/src/apps/personal/overlays/maintainers.nix b/src/apps/personal/overlays/maintainers.nix
index 97214f7..b814982 100644
--- a/src/apps/personal/overlays/maintainers.nix
+++ b/src/apps/personal/overlays/maintainers.nix
@@ -1,5 +1,5 @@
 final: prev:  {
-  lib = prev.lib + {
+  lib = prev.lib // {
     maintainers.minion3665 = {
       email = "skyler3665@gmail.com";
       github = "minion3665";