diff --git a/draw2d/advanced_path.go b/draw2d/advanced_path.go
index 5cce444..68f1d78 100644
--- a/draw2d/advanced_path.go
+++ b/draw2d/advanced_path.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 13/12/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/arc.go b/draw2d/arc.go
index 7e8b78e..0698b8d 100644
--- a/draw2d/arc.go
+++ b/draw2d/arc.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/curves.go b/draw2d/curves.go
index a2f4d9a..4623cd4 100644
--- a/draw2d/curves.go
+++ b/draw2d/curves.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/dasher.go b/draw2d/dasher.go
index 102635c..5210299 100644
--- a/draw2d/dasher.go
+++ b/draw2d/dasher.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 13/12/2010 by Laurent Le Goff
+
 package draw2d
 
 type DashVertexConverter struct {
diff --git a/draw2d/demux_converter.go b/draw2d/demux_converter.go
index fd9ea4c..b5c871d 100644
--- a/draw2d/demux_converter.go
+++ b/draw2d/demux_converter.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 13/12/2010 by Laurent Le Goff
+
 package draw2d
 
 type DemuxConverter struct {
diff --git a/draw2d/font.go b/draw2d/font.go
index a0e7650..61c39ff 100644
--- a/draw2d/font.go
+++ b/draw2d/font.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 13/12/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/gc.go b/draw2d/gc.go
index 105ba23..8ced348 100644
--- a/draw2d/gc.go
+++ b/draw2d/gc.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
@@ -15,8 +16,9 @@ const (
 )
 
 type GraphicContext interface {
-	BeginPath()
 	Path
+	// Create a new path
+	BeginPath()
 	GetMatrixTransform() MatrixTransform
 	SetMatrixTransform(tr MatrixTransform)
 	ComposeMatrixTransform(tr MatrixTransform)
diff --git a/draw2d/image.go b/draw2d/image.go
index 9df39e4..1ff136d 100644
--- a/draw2d/image.go
+++ b/draw2d/image.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/math.go b/draw2d/math.go
index 9323818..c4bb761 100644
--- a/draw2d/math.go
+++ b/draw2d/math.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/paint.go b/draw2d/paint.go
index f2f8fc1..885d993 100644
--- a/draw2d/paint.go
+++ b/draw2d/paint.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 /*
diff --git a/draw2d/path.go b/draw2d/path.go
index 558b433..ab51810 100644
--- a/draw2d/path.go
+++ b/draw2d/path.go
@@ -1,13 +1,22 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 type Path interface {
+	// Return the current point of the path
 	LastPoint() (x, y float64)
+	// Create a new subpath that start at the specified point
 	MoveTo(x, y float64)
+	// Create a new subpath that start at the specified point 
+	// relative to the current point
 	RMoveTo(dx, dy float64)
+	// Add a line to the current subpath
 	LineTo(x, y float64)
+	// Add a line to the current subpath 
+	// relative to the current point
 	RLineTo(dx, dy float64)
+	
 	QuadCurveTo(cx, cy, x, y float64)
 	RQuadCurveTo(dcx, dcy, dx, dy float64)
 	CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64)
diff --git a/draw2d/path_adder.go b/draw2d/path_adder.go
index 4e64c64..c5efd2b 100644
--- a/draw2d/path_adder.go
+++ b/draw2d/path_adder.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 13/12/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/path_converter.go b/draw2d/path_converter.go
index 9f6a763..0ef96b8 100644
--- a/draw2d/path_converter.go
+++ b/draw2d/path_converter.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 06/12/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/path_storage.go b/draw2d/path_storage.go
index 57b6f91..c2a8870 100644
--- a/draw2d/path_storage.go
+++ b/draw2d/path_storage.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/rgba_interpolation.go b/draw2d/rgba_interpolation.go
index 5b065f6..d34a33b 100644
--- a/draw2d/rgba_interpolation.go
+++ b/draw2d/rgba_interpolation.go
@@ -1,4 +1,7 @@
+// Copyright 2010 The draw2d Authors. All rights reserved.
+// created: 21/11/2010 by Laurent Le Goff
 // see http://pippin.gimp.org/image_processing/chap_resampling.html
+
 package draw2d
 
 import (
diff --git a/draw2d/stack_gc.go b/draw2d/stack_gc.go
index cc7b795..8c2cda6 100644
--- a/draw2d/stack_gc.go
+++ b/draw2d/stack_gc.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/stroker.go b/draw2d/stroker.go
index 88a0bb8..9331187 100644
--- a/draw2d/stroker.go
+++ b/draw2d/stroker.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 13/12/2010 by Laurent Le Goff
+
 package draw2d
 
 type Cap int
diff --git a/draw2d/transform.go b/draw2d/transform.go
index 1f39b9f..1d89bfa 100644
--- a/draw2d/transform.go
+++ b/draw2d/transform.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 import (
diff --git a/draw2d/vertex2d.go b/draw2d/vertex2d.go
index c544cd5..4e4d4fd 100644
--- a/draw2d/vertex2d.go
+++ b/draw2d/vertex2d.go
@@ -1,5 +1,6 @@
 // Copyright 2010 The draw2d Authors. All rights reserved.
 // created: 21/11/2010 by Laurent Le Goff
+
 package draw2d
 
 type VertexCommand byte