diff --git a/Makefile b/Makefile
index fcf75a3..0e70650 100644
--- a/Makefile
+++ b/Makefile
@@ -368,6 +368,11 @@ DEVCONTAINER_IMAGE ?= ghcr.io/sciexp/flytezendev
 drundc: ## Run devcontainer. make drundc DEVCONTAINER_IMAGE=
 	docker run --rm -it $(DEVCONTAINER_IMAGE)
 
+adhocpkgs: ## Install adhoc nix packages. make adhocpkgs ADHOC_NIX_PKGS="gnugrep fzf"
+	nix profile list
+	$(foreach pkg, $(ADHOC_NIX_PKGS), nix profile install nixpkgs#$(pkg);)
+	nix profile list
+
 .PHONY: jupyter
 jupyter: ## Run jupyter lab in devcontainer. make jupyter DEVCONTAINER_IMAGE=ghcr.io/sciexp/flytezendev@sha256:055bb57be472144bb140e20870320da8d9fa39daf69a57d2464596b974d34138
 	@echo "Attempting to start jupyter lab in"
diff --git a/flake.nix b/flake.nix
index d640e26..6a0ad41 100644
--- a/flake.nix
+++ b/flake.nix
@@ -249,9 +249,9 @@
           url = "https://github.com/${gitHubOrg}/${packageName}.git";
           # the ref is not strictly required when specifying a rev but it should
           # be included whenever possible or it may be necessary to include
-          # ref = "main";
+          ref = "main";
           # allRefs = true;
-          ref = "26-nix-profile";
+          # ref = "NN-feature";
           # the rev can be omitted transiently in development to track the HEAD
           # of a ref but doing so requires `--impure` image builds (this may
           # already be required for other reasons, e.g. `builtins.getEnv`)