diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
index 7cf3410..7af713a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 /result
 /TODO
 /docs/iamb.[15]
+.direnv