diff --git a/lib/canvas.mli b/lib/canvas.mli
index 7192d1c..a402467 100644
--- a/lib/canvas.mli
+++ b/lib/canvas.mli
@@ -8,5 +8,4 @@ val doc : Html.document Js_of_ocaml.Js.t
 val _window : Html.window Js_of_ocaml.Js.t
 
 module C : Modules.Impl
-
-module Backend : Modules.Backend
\ No newline at end of file
+module Backend : Modules.Backend
diff --git a/lib/modules.ml b/lib/modules.ml
index 9069737..442f22c 100644
--- a/lib/modules.ml
+++ b/lib/modules.ml
@@ -23,6 +23,7 @@ end
 
 module type Backend = sig
   type context
+
   val context : context option ref
 
   type 'a point = 'a Shape.point
@@ -45,12 +46,11 @@ module type Backend = sig
   val with_fill : color -> shape -> shape
   val map_stroke : (color -> color) -> shape -> shape
   val map_fill : (color -> color) -> shape -> shape
-
-  val white : color 
-  val black : color 
-  val red : color 
-  val blue : color 
-  val green : color 
+  val white : color
+  val black : color
+  val red : color
+  val blue : color
+  val green : color
   val yellow : color
 
   val compose :
@@ -76,11 +76,12 @@ end
 
 module Make (B : Impl) : Backend with type context = B.context = struct
   type context = B.context
+
   let context = B.context
 
-  include Shape 
-  include Transform 
-  include Color 
+  include Shape
+  include Transform
+  include Color
 
   let set_line_width = B.set_line_width
   let resolution = B.resolution
diff --git a/lib/modules.mli b/lib/modules.mli
index 4b310e6..a060285 100644
--- a/lib/modules.mli
+++ b/lib/modules.mli
@@ -19,6 +19,7 @@ end
 
 module type Backend = sig
   type context
+
   val context : context option ref
 
   type 'a point = 'a Shape.point
@@ -41,12 +42,11 @@ module type Backend = sig
   val with_fill : color -> shape -> shape
   val map_stroke : (color -> color) -> shape -> shape
   val map_fill : (color -> color) -> shape -> shape
-
-  val white : color 
-  val black : color 
-  val red : color 
-  val blue : color 
-  val green : color 
+  val white : color
+  val black : color
+  val red : color
+  val blue : color
+  val green : color
   val yellow : color
 
   val compose :
diff --git a/lib/svg.mli b/lib/svg.mli
index 4f0b9d1..b13a2fd 100644
--- a/lib/svg.mli
+++ b/lib/svg.mli
@@ -1,3 +1,2 @@
 module S : Modules.Impl
-
 module Backend : Modules.Backend