diff --git a/Makefile b/Makefile
index 2f127a3..ef5ce03 100644
--- a/Makefile
+++ b/Makefile
@@ -18,3 +18,7 @@ uninstall:
 distrib:
 	dune-release tag
 	dune-release
+
+format:
+	ocamlformat kicadsch/src/*.ml[i] --inplace
+	ocamlformat plotkicadsch/src/*.ml[i] --inplace
diff --git a/kicadsch/src/.ocamlformat b/kicadsch/src/.ocamlformat
new file mode 100644
index 0000000..f0340fe
--- /dev/null
+++ b/kicadsch/src/.ocamlformat
@@ -0,0 +1,7 @@
+profile = default
+version = 0.20.1
+break-cases = nested
+margin = 77
+parse-docstrings = true
+wrap-comments = true
+line-endings = lf
diff --git a/kicadsch/src/kicadSch_sigs.mli b/kicadsch/src/kicadSch_sigs.mli
index c410e02..aa87a69 100644
--- a/kicadsch/src/kicadSch_sigs.mli
+++ b/kicadsch/src/kicadSch_sigs.mli
@@ -1,5 +1,4 @@
-(**
-   Kicad modules Signatures *)
+(** Kicad modules Signatures *)
 
 (** orientation of a text *)
 type orientation = Orient_H | Orient_V  (** *)
@@ -16,70 +15,69 @@ type justify = J_left | J_right | J_center | J_bottom | J_top  (** *)
 (** Style of a text *)
 type style = Bold | Italic | BoldItalic | NoStyle  (** *)
 
+type kolor = [ `NoColor | `Black | `Green | `Red | `Blue | `Brown ]
 (** Color of the text. These are the colors appearing in Kicad schematics *)
-type kolor = [`NoColor | `Black | `Green | `Red | `Blue | `Brown]
 
-(** Transformation matrix of a relative coordinate around an absolute coordinate.
-    The matrix is layed out as a pair of lines of pairs *)
 type transfo = (int * int) * (int * int)
+(** Transformation matrix of a relative coordinate around an absolute
+    coordinate. The matrix is layed out as a pair of lines of pairs *)
 
-type revision =
-  | First of string
-  | Second of string
-  | No_Rev
+type revision = First of string | Second of string | No_Rev
 
 module type Painter = sig
-  (** A module able to paint a canvas with several graphic primitives
-      and then to process the canvas into a picture file format.  The
-      functions are supposed to be pure *)
+  (** A module able to paint a canvas with several graphic primitives and
+      then to process the canvas into a picture file format. The functions
+      are supposed to be pure *)
 
-  (** the canvas of the painter *)
   type t
+  (** the canvas of the painter *)
 
   val paint_text :
-       ?kolor:kolor
-    -> String.t
-    -> orientation
-    -> coord
-    -> size
-    -> justify
-    -> style
-    -> t
-    -> t
-  (** [paint ?kolor text orient coord size justification style canvas]
-      adds a [text] with the given [orient], [size], [justification]
-      and [style] at the given [coord] to [canvas].
+    ?kolor:kolor ->
+    String.t ->
+    orientation ->
+    coord ->
+    size ->
+    justify ->
+    style ->
+    t ->
+    t
+  (** [paint ?kolor text orient coord size justification style canvas] adds a
+      [text] with the given [orient], [size], [justification] and [style] at
+      the given [coord] to [canvas].
+
       @return the modified canvas *)
 
   val paint_line : ?kolor:kolor -> ?width:size -> coord -> coord -> t -> t
-  (** [paint_line ?kolor width start end canvas] paints a line with
-      the given [kolor] and [width] between [start] and [stop] on
-      [canvas].
+  (** [paint_line ?kolor width start end canvas] paints a line with the given
+      [kolor] and [width] between [start] and [stop] on [canvas].
+
       @return the modified canvas *)
 
   val paint_circle : ?kolor:kolor -> ?fill:kolor -> coord -> int -> t -> t
-  (** [paint_circle ?kolor center radius canvas] paints a circle
-      filled with the given [kolor] defined by [center] and [radius] on
-      [canvas].
+  (** [paint_circle ?kolor center radius canvas] paints a circle filled with
+      the given [kolor] defined by [center] and [radius] on [canvas].
+
       @return the modified canvas *)
 
   val paint_rect : ?kolor:kolor -> ?fill:kolor -> coord -> coord -> t -> t
-  (** [paint_rect ?kolor corner1 corner2 canvas] paints a rectangle
-      filled with the given [kolor] defined by [corner1] and [corner2]
-      on [canvas].
+  (** [paint_rect ?kolor corner1 corner2 canvas] paints a rectangle filled
+      with the given [kolor] defined by [corner1] and [corner2] on [canvas].
+
       @return the modified canvas *)
 
   val paint_image : coord -> float -> Buffer.t -> t -> t
-  (** [paint_image corner scale png canvas] paints a [png] image
-      filled at [corner], scaled at [scale] on [canvas].
-      @return the
-      modified canvas *)
+  (** [paint_image corner scale png canvas] paints a [png] image filled at
+      [corner], scaled at [scale] on [canvas].
+
+      @return the modified canvas *)
 
   val paint_arc :
     ?kolor:kolor -> ?fill:kolor -> coord -> coord -> coord -> int -> t -> t
   (** [paint_arc ?kolor center start end radius canvas] paints an arc filled
       with [kolor] between [start] and [end] of [radius] around center on
       [canvas].
+
       @return the modified canvas *)
 
   val set_canevas_size : int -> int -> t -> t
@@ -89,66 +87,80 @@ module type Painter = sig
 
   val get_context : unit -> t
   (** [get_context ()]
+
       @return a new painting canvas *)
 end
 
 module type SchPainter = sig
   (** A module able to paint a schematic file in a painter context *)
 
-  (** the schematic context *)
   type schContext
+  (** the schematic context *)
 
-  (** the underlying context *)
   type painterContext
+  (** the underlying context *)
 
-  val initial_context : ?allow_missing_component:bool -> revision -> schContext
+  val initial_context :
+    ?allow_missing_component:bool -> revision -> schContext
   (** [initial_context allow_missing_component revision]
+
       @return an new empty context *)
 
   val add_lib : string -> schContext -> schContext
-  (** [add_lib line context] parse the content of [line] provided to
-      libs to the [context].
+  (** [add_lib line context] parse the content of [line] provided to libs to
+      the [context].
+
       @return the updated context *)
 
   val parse_line : String.t -> schContext -> schContext
-  (** [parse_line line context] parse a new [line] of schematic and
-      update [context].
+  (** [parse_line line context] parse a new [line] of schematic and update
+      [context].
+
       @return the updated context *)
 
   val output_context : schContext -> painterContext
-  (** [output_context context output] write the [context] as a image
-      format to [output] *)
+  (** [output_context context output] write the [context] as a image format
+      to [output] *)
 end
 
 module type CompPainter = sig
-  (** The library that is able to read component libraries and
-      memorize the read components. Then when passed a drawing context
-      and a component to paint it can paint the component on demand to
-      the drawing context *)
+  (** The library that is able to read component libraries and memorize the
+      read components. Then when passed a drawing context and a component to
+      paint it can paint the component on demand to the drawing context *)
 
-  (** A component Library manager *)
   type t
+  (** A component Library manager *)
 
-  (** A drawing context *)
   type drawContext
+  (** A drawing context *)
 
   val lib : unit -> t
   (** [lib ()]
+
       @return an empty new component manager *)
 
   val append_lib : string -> t -> t
-  (** [append_lib stream context] appends the lib contained in the
-      [stream] to the context.
+  (** [append_lib stream context] appends the lib contained in the [stream]
+      to the context.
+
       @return the updated context *)
 
   val plot_comp :
-    t -> string -> int -> coord -> transfo -> bool -> drawContext -> drawContext * bool
-    (** [plot_comp lib name partnumber origin transformation
-       allow_missing context] find in [lib] the component with given
-       [name] and plot the part [partnumber] at [origin] after
-       [transformation] into the graphical [context] and the fact that
-       the component is multipart. If the component is not found, raise
-       an exception, unless [allow_missing] is true.
-
-       @return the updated graphical context *)
+    t ->
+    string ->
+    int ->
+    coord ->
+    transfo ->
+    bool ->
+    drawContext ->
+    drawContext * bool
+  (** [plot_comp lib name partnumber origin transformation
+       allow_missing context]
+      find in [lib] the component with given [name] and plot the part
+      [partnumber] at [origin] after [transformation] into the graphical
+      [context] and the fact that the component is multipart. If the
+      component is not found, raise an exception, unless [allow_missing] is
+      true.
+
+      @return the updated graphical context *)
 end
diff --git a/plotkicadsch/src/.ocamlformat b/plotkicadsch/src/.ocamlformat
new file mode 100644
index 0000000..f0340fe
--- /dev/null
+++ b/plotkicadsch/src/.ocamlformat
@@ -0,0 +1,7 @@
+profile = default
+version = 0.20.1
+break-cases = nested
+margin = 77
+parse-docstrings = true
+wrap-comments = true
+line-endings = lf
diff --git a/plotkicadsch/src/boundingBox.mli b/plotkicadsch/src/boundingBox.mli
index 59486e5..80e3b46 100644
--- a/plotkicadsch/src/boundingBox.mli
+++ b/plotkicadsch/src/boundingBox.mli
@@ -2,19 +2,12 @@ open Kicadsch.Sigs
 
 type t
 
-val create: unit -> t
-
-val create_from_rect: coord -> coord -> t
-
-val create_from_limits: coord -> coord -> t
-
-val add_rect: t -> t -> t
-
-val add_point: t -> coord -> t
-
-val reformat: min_size:int -> extend:int -> t -> t
-val as_rect: t -> coord*coord
-
-val overlap_ratio: t -> t -> float
-
-val compare: t -> t -> int
+val create : unit -> t
+val create_from_rect : coord -> coord -> t
+val create_from_limits : coord -> coord -> t
+val add_rect : t -> t -> t
+val add_point : t -> coord -> t
+val reformat : min_size:int -> extend:int -> t -> t
+val as_rect : t -> coord * coord
+val overlap_ratio : t -> t -> float
+val compare : t -> t -> int
diff --git a/plotkicadsch/src/kicadDiff.mli b/plotkicadsch/src/kicadDiff.mli
index f29a149..ed2ad4d 100644
--- a/plotkicadsch/src/kicadDiff.mli
+++ b/plotkicadsch/src/kicadDiff.mli
@@ -1,26 +1,35 @@
-(**
-   schematic diffing module *)
+(** schematic diffing module *)
 
 (** type of diffing. If internal, specify the application for showing SVGs **)
 type differ = Internal of string | Image_Diff
 
-(** type of the file system for each leg of the diff *)
 type t
+(** type of the file system for each leg of the diff *)
 
+val git_fs : string -> t
 (** [git_fs rev] builds a file system tree based on a git revision [rev] *)
-val git_fs: string -> t
 
+val true_fs : string -> t
 (** [true_fs root] builds a fs from the file system [root] directory *)
-val true_fs: string -> t
 
+val doc : t -> string
 (** [doc fs] outputs the doc string of the file system [fs] *)
-val doc: t -> string
 
+val doit :
+  t ->
+  t ->
+  string option ->
+  differ ->
+  bool ->
+  string list ->
+  bool ->
+  SvgPainter.diff_colors option ->
+  string option ->
+  bool ->
+  string option ->
+  unit
 (** [doit fs_from fs_to filename differ textdiff libs keep colors allow_missing relative_path]
-    performs the diff of [filename] from [relative_path] if present between [fs_from] and [fs_to]
-    using strategy [differ] and using common [libs] and [colors]
-    scheme. If [textdiff], then a text diff is shown when no visual
+    performs the diff of [filename] from [relative_path] if present between
+    [fs_from] and [fs_to] using strategy [differ] and using common [libs] and
+    [colors] scheme. If [textdiff], then a text diff is shown when no visual
     diff, if [keep] then the diff file isn't removed after *)
-val doit: t -> t -> string option ->
-  differ -> bool -> string list -> bool ->
-  SvgPainter.diff_colors option -> string option -> bool -> string option -> unit
diff --git a/plotkicadsch/src/sysAbst.mli b/plotkicadsch/src/sysAbst.mli
index 7046025..2a57e4f 100644
--- a/plotkicadsch/src/sysAbst.mli
+++ b/plotkicadsch/src/sysAbst.mli
@@ -1,10 +1,7 @@
 val pread : string -> string array -> string Lwt.t
-
 val exec : string -> string array -> Unix.process_status Lwt.t
 
 (* the two following function are meant to be used together *)
 val build_tmp_svg_name : keep:bool -> string -> string list -> string
-
 val finalize_tmp_file : string -> keep:bool -> unit Lwt.t
-
 val default_opener : unit -> string