diff --git a/td6/exo2.ml b/td6/exo2.ml
deleted file mode 100644
index e891e00..0000000
--- a/td6/exo2.ml
+++ /dev/null
@@ -1,7 +0,0 @@
-let radix l =
-  let r = ref 0 in
-  let running = ref true in
-  while !running do
-    running := false;
-    List.fold_left
-  done
diff --git a/td6/ocaml/dune-project b/td6/ocaml/dune-project
new file mode 100644
index 0000000..4dddbec
--- /dev/null
+++ b/td6/ocaml/dune-project
@@ -0,0 +1,26 @@
+(lang dune 3.20)
+
+(name td6)
+
+(generate_opam_files true)
+
+(source
+ (github username/reponame))
+
+(authors "Author Name <author@example.com>")
+
+(maintainers "Maintainer Name <maintainer@example.com>")
+
+(license LICENSE)
+
+(documentation https://url/to/documentation)
+
+(package
+ (name td6)
+ (synopsis "A short synopsis")
+ (description "A longer description")
+ (depends ocaml)
+ (tags
+  ("add topics" "to describe" your project)))
+
+; See the complete stanza docs at https://dune.readthedocs.io/en/stable/reference/dune-project/index.html
diff --git a/td6/ocaml/lib/dune b/td6/ocaml/lib/dune
new file mode 100644
index 0000000..40894a0
--- /dev/null
+++ b/td6/ocaml/lib/dune
@@ -0,0 +1,3 @@
+(library
+ (name lib)
+ (public_name td6))
diff --git a/td6/ocaml/lib/lib.ml b/td6/ocaml/lib/lib.ml
new file mode 100644
index 0000000..94097a4
--- /dev/null
+++ b/td6/ocaml/lib/lib.ml
@@ -0,0 +1,3 @@
+let radix l =
+  let r = ref 0 in
+  let running = ref true in
diff --git a/td6/ocaml/td6.opam b/td6/ocaml/td6.opam
new file mode 100644
index 0000000..a43bbcb
--- /dev/null
+++ b/td6/ocaml/td6.opam
@@ -0,0 +1,32 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "A short synopsis"
+description: "A longer description"
+maintainer: ["Maintainer Name <maintainer@example.com>"]
+authors: ["Author Name <author@example.com>"]
+license: "LICENSE"
+tags: ["add topics" "to describe" "your" "project"]
+homepage: "https://github.com/username/reponame"
+doc: "https://url/to/documentation"
+bug-reports: "https://github.com/username/reponame/issues"
+depends: [
+  "dune" {>= "3.20"}
+  "ocaml"
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/username/reponame.git"
+x-maintenance-intent: ["(latest)"]
diff --git a/td6/ocaml/test/dune b/td6/ocaml/test/dune
new file mode 100644
index 0000000..d2d6441
--- /dev/null
+++ b/td6/ocaml/test/dune
@@ -0,0 +1,4 @@
+(executable
+ (name test)
+ (public_name test)
+ (libraries lib))
diff --git a/td6/ocaml/test/test.ml b/td6/ocaml/test/test.ml
new file mode 100644
index 0000000..b5df65f
--- /dev/null
+++ b/td6/ocaml/test/test.ml
@@ -0,0 +1 @@
+open Lib;;