diff --git a/src/lfile.c b/src/lfile.c
index a7247ab..83323fe 100644
--- a/src/lfile.c
+++ b/src/lfile.c
@@ -2,6 +2,8 @@
  * @file lfile.c
  *
  * @brief Handle read/write abstractions to the users directory.
+ *
+ * @todo Add support for windows and mac OS.
  */
 
 #include <string.h>
diff --git a/src/opengl.c b/src/opengl.c
index 7076618..1681b65 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -15,13 +15,10 @@
 #include "opengl.h"
 
 /* Requirements. */
-#define OPENGL_REQ_MULTITEX 2 /* 2 is minimum OpenGL 1.2. Must have. */
+#define OPENGL_REQ_MULTITEX 2 /**< 2 is minimum OpenGL 1.2. Must have. */
 
-/* The screen info, gives data of current opengl settings. */
-glInfo gl_screen;
-
-/* Our precious camera. */
-Vec2* gl_camera;
+glInfo gl_screen; /**< Give data of current opengl settings. */
+Vec2* gl_camera;  /**< Camera we are using. */
 
 /* offsets to Adjust the pilot's place onscreen */
 /*to be in the middle, even with the GUI. */
diff --git a/src/opengl.h b/src/opengl.h
index 2ba01f2..18529a6 100644
--- a/src/opengl.h
+++ b/src/opengl.h
@@ -20,31 +20,47 @@
 #define RGBAMASK RMASK,GMASK,BMASK,AMASK
 
 /* Info about opengl screen. */
-#define OPENGL_FULLSCREEN   (1<<0)
-#define OPENGL_DOUBLEBUF    (1<<1)
-#define OPENGL_AA_POINT     (1<<2)
-#define OPENGL_AA_LINE      (1<<3)
-#define OPENGL_AA_POLYGON   (1<<4)
-#define OPENGL_FRAG_SHADER  (1<<5)
-#define OPENGL_VERT_SHADER  (1<<6)
-#define gl_has(f)           (gl_screen.flags & (f)) /* Check for the flag. */
+#define OPENGL_FULLSCREEN   (1<<0)    /**< Fullscreen. */
+#define OPENGL_DOUBLEBUF    (1<<1)    /**< Doublebuffer. */
+#define OPENGL_AA_POINT     (1<<2)    /**< Antialiasing points. */
+#define OPENGL_AA_LINE      (1<<3)    /**< Antialiasing lines. */
+#define OPENGL_AA_POLYGON   (1<<4)    /**< Antialiasing polygons. */
+#define OPENGL_FRAG_SHADER  (1<<5)    /**< Fragment shaders. */
+#define OPENGL_VERT_SHADER  (1<<6)    /**< Vertex shaders. */
+#define gl_has(f)           (gl_screen.flags & (f)) /**< Check for the flag. */
+
+/**
+ * @struct glInfo
+ *
+ * @brief Store data about the current opengl environment.
+ */
 typedef struct glInfo_ {
-  int w, h;         /* Window dimensions. */
-  int depth;        /* Depth in bpp. */
-  int r, g, b, a;   /* Framebuffer values in bits. */
-  int flags;        /* Store different properties. */
-  int tex_max;      /* Max texture size. */
-  int multitex_max; /* Max multitexture levels. */
+  int w;            /**< Window width. */
+  int h;            /**< Window height. */
+  int depth;        /**< Depth in bpp. */
+  int r;            /**< Amount of red bits. */
+  int g;            /**< Amount of green bits. */
+  int b;            /**< Amount of blue bits. */
+  int a;            /**< Amount of alpha bits. */
+  int flags;        /**< Store different properties. */
+  int tex_max;      /**< Max texture size. */
+  int multitex_max; /**< Max multitexture levels. */
 } glInfo;
 extern glInfo gl_screen; /* Local structure set with gl_init etc. */
 
-#define SCREEN_W      gl_screen.w
-#define SCREEN_H      gl_screen.h
+#define SCREEN_W      gl_screen.w   /**< Screen width. */
+#define SCREEN_H      gl_screen.h   /**< Screen height. */
 
-#define COLOUR(x)     glColor4d((x).r, (x).g, (x).b, (x).a)
-#define ACOLOUR(x,a)  glColor4d((x).r, (x).g, (x).b, a)
+#define COLOUR(x)     glColor4d((x).r, (x).g, (x).b, (x).a) /**< Change colour. */
+#define ACOLOUR(x,a)  glColor4d((x).r, (x).g, (x).b, a) /**< Change colour and override alpha. */
 
-/* Spritesheet info. */
+/**
+ * @struct glTexture
+ *
+ * @brief Abstraction for rendering spritesheets.
+ *
+ * The basic unit all the graphic rendering works with.
+ */
 typedef struct glTexture_ {
   char* name;         /**< Name of graphic. */