diff --git a/.ocamlformat b/.ocamlformat
index 0b457a3..ffb06fc 100644
--- a/.ocamlformat
+++ b/.ocamlformat
@@ -1,2 +1,4 @@
 profile = default
-version = 0.26.2
+version = 0.27.0
+
+exp-grouping=preserve
diff --git a/bench/orchestrator.mli b/bench/orchestrator.mli
index 074f57b..e848766 100644
--- a/bench/orchestrator.mli
+++ b/bench/orchestrator.mli
@@ -1,37 +1,34 @@
-(** Helper library that ensures all workers have started before any
-  starts making progress on the benchmark. *)
+(** Helper library that ensures all workers have started before any starts
+    making progress on the benchmark. *)
 
 type t
-(** An orchestrator is similar to a counter that ensures each domain
-    has started and complete each round simultanously. All domains
-    wait for the other before beginning the next round. *)
+(** An orchestrator is similar to a counter that ensures each domain has started
+    and complete each round simultanously. All domains wait for the other before
+    beginning the next round. *)
 
 val init : total_domains:int -> rounds:int -> t
-(** [init ~total_domains:nd ~rounds:nr] create an orchestrator that
-    will run [nr] rounds for a test that uses exactly [nd] worker
-    domains *)
+(** [init ~total_domains:nd ~rounds:nr] create an orchestrator that will run
+    [nr] rounds for a test that uses exactly [nd] worker domains *)
 
 val worker : t -> (unit -> unit) -> unit
-(** [worker t f] builds the function to pass to [Domain.spawn] while
-    using the orchestrator [t]. Doing [Domain.spawn (fun () -> worker
-    t f)] is similar to [Domain.spawn f] except that the orchestrator
-    is used to synchronize all domains progress.
- *)
+(** [worker t f] builds the function to pass to [Domain.spawn] while using the
+    orchestrator [t]. Doing [Domain.spawn (fun () -> worker t f)] is similar to
+    [Domain.spawn f] except that the orchestrator is used to synchronize all
+    domains progress. *)
 
 val run : ?drop_first:bool -> t -> float List.t
-(** [run t] is launching the benchmark by enabling domains to progress. Benchmarks code should have the following structure :
+(** [run t] is launching the benchmark by enabling domains to progress.
+    Benchmarks code should have the following structure :
 
-{[
-   (* Initialize the orchestrator, with [nd] the number of domains we want. *)
-   let orchestrator = init ~total_domain:nd ~round:100 in
-   (* Spawn domains with [worker] *)
-   let domains =
-         List.init nd (fun _ ->
-               Domain.spawn (fun () ->
-                      worker orchestrator (fun () -> some_function ()))) in
-   (* Run the benchmarks by freeing domains round by round. *)
-   let times = run orchestrator in
-   ...
-]}
-
-*)
+    {[
+      (* Initialize the orchestrator, with [nd] the number of domains we want. *)
+      let orchestrator = init ~total_domain:nd ~round:100 in
+      (* Spawn domains with [worker] *)
+      let domains =
+            List.init nd (fun _ ->
+                  Domain.spawn (fun () ->
+                         worker orchestrator (fun () -> some_function ()))) in
+      (* Run the benchmarks by freeing domains round by round. *)
+      let times = run orchestrator in
+      ...
+    ]} *)
diff --git a/bench/taslock.ml b/bench/taslock.ml
index f5769d1..469ab27 100644
--- a/bench/taslock.ml
+++ b/bench/taslock.ml
@@ -15,9 +15,10 @@ module TASlock : LOCK = struct
   let create () = Atomic.make false
 
   let rec acquire t =
-    if not @@ Atomic.compare_and_set t false true then (
+    if not @@ Atomic.compare_and_set t false true then begin
       Domain.cpu_relax ();
-      acquire t)
+      acquire t
+    end
 
   let release t = Atomic.set t false
 end
@@ -28,12 +29,14 @@ module TTASlock : LOCK = struct
   let create () = Atomic.make false
 
   let rec acquire t =
-    if Atomic.get t then (
+    if Atomic.get t then begin
       Domain.cpu_relax ();
-      acquire t)
-    else if not (Atomic.compare_and_set t false true) then (
+      acquire t
+    end
+    else if not (Atomic.compare_and_set t false true) then begin
       Domain.cpu_relax ();
-      acquire t)
+      acquire t
+    end
 
   let release t = Atomic.set t false
 end
@@ -44,9 +47,10 @@ module TTASlock_boff : LOCK = struct
   let create () = Atomic.make false
 
   let rec acquire_ ?(backoff = Backoff.default) t =
-    if Atomic.get t then (
+    if Atomic.get t then begin
       Domain.cpu_relax ();
-      acquire_ ~backoff t)
+      acquire_ ~backoff t
+    end
     else if not (Atomic.compare_and_set t false true) then
       acquire_ ~backoff:(Backoff.once backoff) t
 
diff --git a/src/backoff.mli b/src/backoff.mli
index f032c4b..b00b5f3 100644
--- a/src/backoff.mli
+++ b/src/backoff.mli
@@ -25,7 +25,7 @@ val max_wait_log : int
 (** Logarithm of the maximum allowed value for wait. *)
 
 val create : ?lower_wait_log:int -> ?upper_wait_log:int -> unit -> t
-(** [create] creates a backoff value.  [upper_wait_log], [lower_wait_log]
+(** [create] creates a backoff value. [upper_wait_log], [lower_wait_log]
     override the logarithmic upper and lower bound on the number of spins
     executed by {!once}. *)