diff --git a/src/Render/Render.hs b/src/Render/Render.hs
index 59fe4ed..0cd5464 100644
--- a/src/Render/Render.hs
+++ b/src/Render/Render.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE BangPatterns, InstanceSigs, ExistentialQuantification #-}
-module Render.Render where
+module Render.Render (initBuffer, initMapShader, initBuffer, initHud, initRendering, render) where
 
 import qualified Data.ByteString                            as B
 import           Foreign.Marshal.Array                      (withArray)
diff --git a/src/Render/Types.hs b/src/Render/Types.hs
index 5191322..db778df 100644
--- a/src/Render/Types.hs
+++ b/src/Render/Types.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE RankNTypes #-}
+-- | Types specific to Rendering-Issues
 module Render.Types (createFlatCam, createSphereCam, Camera, GLCamera(..)) where
 
 import Linear
@@ -12,18 +13,22 @@ import qualified Debug.Trace as D
 type Distance = Double
 type Pitch = Double
 type Yaw = Double
-
-class GLCamera a where
-  getCam :: a -> Distance -> Pitch -> Yaw -> M44 CFloat
-  moveBy :: a -> (Position -> Position) -> PlayMap -> a
-  move   :: a -> Position -> PlayMap -> a
-
-type Position = (Double, Double)
-
 type Radius = Double
-
 type Height = Double
 
+-- | a Typclass for different Cameras
+class GLCamera a where
+  -- | Gets the current Camera-Matrix for a given Cam, Distance Pitch and Yaw
+  getCam :: a -> Distance -> Pitch -> Yaw -> M44 CFloat
+  -- | Moves the Camera-Target on a projected 2D-plane
+  moveBy :: a -> (Position -> Position) -> PlayMap -> a
+  -- | Moves the Camera-Target to an absoloute position
+  move   :: a -> Position -> PlayMap -> a
+
+-- | Alias for a camera-position onto the 2d-plane it moves on
+type Position = (Double, Double)
+
+-- | Camera-Type. Either a Camera onto a 2D-flat-map or a spherical map
 data Camera = Flat Position Height
             | Sphere Position Radius
 
@@ -35,7 +40,9 @@ createFlatCam x z map' = Flat (x,z) (giveMapHeight map' (x, z))
 createSphereCam :: Double -> Double -> Double -> Camera
 createSphereCam p a = Sphere (p,a)
 
-
+-- | our Camera is indeed a GLCamera that we can use
+--
+-- TODO: Sphere-Cam still undefined
 instance GLCamera Camera where
   getCam (Flat (x',z') y') dist' xa' ya' =
         lookAt (cpos ^+^ at') at' up
@@ -82,6 +89,7 @@ instance GLCamera Camera where
 					y     = giveMapHeight map (x,z)
   move c (x', z') map = moveBy c (\(x,z) -> (x+x',z+z')) map
 
+-- | converting spherical to cartesian coordinates
 sphereToCart :: (Floating a) => a -> a -> a -> V3 a
 sphereToCart r inc az = V3
                                    (r * (sin inc) * (cos az))
diff --git a/src/Types.hs b/src/Types.hs
index 7a27ed9..dae0916 100644
--- a/src/Types.hs
+++ b/src/Types.hs
@@ -192,15 +192,20 @@ $(makeLenses ''UIState)
 -- helper-functions for types
 
 -- | atomically change gamestate on condition
-changeIfGamestate :: (GameState -> Bool) -> (GameState -> GameState) -> Pioneers ()
+changeIfGamestate :: (GameState -> Bool) -> (GameState -> GameState) -> Pioneers Bool
 changeIfGamestate cond f = do
 	state <- get
 	liftIO $ atomically $ do
 		game' <- readTVar (state ^. game)
-		when (cond game') (writeTVar (state ^. game) (f game'))
+        let cond' = cond game'
+		when cond' (writeTVar (state ^. game) (f game'))
+        return cond'
 
 
 -- | atomically change gamestate
 changeGamestate :: (GameState -> GameState) -> Pioneers ()
-changeGamestate = changeIfGamestate (const True) 
+changeGamestate = do
+                    --forget implied result - is True anyway
+                    _ <- changeIfGamestate (const True)
+                    return ()