diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a4fd0d4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+ocaml/_coverage
diff --git a/ocaml/dune-project b/ocaml/dune-project
index a1e3d6d..2a2ffb2 100644
--- a/ocaml/dune-project
+++ b/ocaml/dune-project
@@ -24,6 +24,7 @@
     (depends
         (ocaml (>= 5.3.0))
         (dune (>= 3.17.2))
+        (bisect_ppx (and :dev (>= 2.5.0)))
     )
 )
 
diff --git a/ocaml/justfile b/ocaml/justfile
new file mode 100644
index 0000000..4a9ad9d
--- /dev/null
+++ b/ocaml/justfile
@@ -0,0 +1,25 @@
+default:
+    @just --list
+
+build :
+    dune build
+
+test :
+    dune build
+    dune test
+
+format :
+    dune fmt; dune promote
+
+check-format :
+    dune build fmt
+
+cover :
+    find . -name '*.coverage' -exec rm -v '{}' ';'
+    dune build
+    dune runtest --instrument-with bisect_ppx --force
+    bisect-ppx-report html
+    bisect-ppx-report summary
+
+clean :
+    dune clean
diff --git a/ocaml/lib/dune b/ocaml/lib/dune
index 8c5b22d..872c4ef 100644
--- a/ocaml/lib/dune
+++ b/ocaml/lib/dune
@@ -1,6 +1,7 @@
 (library
     (name tori)
     (libraries unix)
+    (instrumentation (backend bisect_ppx))
 )
 
 (include_subdirs qualified)
diff --git a/ocaml/tori.opam b/ocaml/tori.opam
index baff66b..ab446cc 100644
--- a/ocaml/tori.opam
+++ b/ocaml/tori.opam
@@ -18,6 +18,7 @@ doc: "https://tori.jutty.dev/docs"
 depends: [
   "ocaml" {>= "5.3.0"}
   "dune" {>= "3.17" & >= "3.17.2"}
+  "bisect_ppx" {dev & >= "2.5.0"}
   "odoc" {with-doc}
 ]
 build: [