diff --git a/d3/shader.py b/d3/shader.py
index c0ba932..e55cc7e 100644
--- a/d3/shader.py
+++ b/d3/shader.py
@@ -4,16 +4,22 @@ dir_path = os.path.dirname(os.path.realpath(__file__))
 import OpenGL.GL as gl
 import OpenGL.GL.shaders as sh
 
-class DefaultShader:
+default_vertex_path = dir_path + '/../assets/shaders/shader.vert'
+default_fragment_path = dir_path + '/../assets/shaders/shader.frag'
 
-    def __init__(self, vertex_path = None, fragment_path = None):
+class Shader:
+    """Shader
 
-        if vertex_path is None:
-            vertex_path = dir_path + '/../assets/shaders/shader.vert'
-        if fragment_path is None:
-            fragment_path = dir_path + '/../assets/shaders/shader.frag'
+    Loads, compile and binds the shader that are in the assets/shaders
+    directory
+    """
 
+    def __init__(self, vertex_path = default_vertex_path, fragment_path = default_fragment_path):
+        """Creates a shader object, and compile it
 
+        :param vertex_path: path to the vertex shader
+        :param fragment_path: path to the fragment shader
+        """
         with open(vertex_path) as f:
             self.vertex_src = f.read()
 
@@ -23,17 +29,25 @@ class DefaultShader:
         self.compile_shaders()
         self.compile_program()
 
-
     def compile_shaders(self):
+        """ Compiles the shader
+        """
         self.vertex_shader = sh.compileShader(self.vertex_src, gl.GL_VERTEX_SHADER)
         self.fragment_shader = sh.compileShader(self.fragment_src, gl.GL_FRAGMENT_SHADER)
 
     def compile_program(self):
+        """Compile the shader program
+
+        The shaders must be compiled
+        """
         self.program = sh.compileProgram(self.vertex_shader, self.fragment_shader)
 
     def bind(self):
+        """Bind the current shader to the OpenGL context
+        """
         gl.glUseProgram(self.program)
 
     def unbind(self):
+        """Reset OpenGL shader to 0
+        """
         gl.glUseProgram(0)
-        pass
diff --git a/viewer.py b/viewer.py
index b73371d..903bd07 100755
--- a/viewer.py
+++ b/viewer.py
@@ -37,7 +37,7 @@ from d3.model.tools import load_model
 from d3.geometry import Vector
 from d3.controls import TrackBallControls, OrbitControls
 from d3.camera import Camera
-from d3.shader import DefaultShader
+from d3.shader import Shader
 
 WINDOW_WIDTH = 1024
 WINDOW_HEIGHT = 1024
@@ -112,7 +112,7 @@ def main(args):
     log(' done!\nGenerating vbos...', file=sys.stderr, end='')
     model.generate_vbos()
 
-    shader = DefaultShader()
+    shader = Shader()
 
     log(' Done!\nReady!', file=sys.stderr)