diff --git a/fhs/.envrc b/fhs/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/fhs/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/trivial/.envrc b/trivial/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/trivial/.envrc
@@ -0,0 +1 @@
+use flake