diff --git a/src/heightmap.h b/src/heightmap.h
--- a/src/heightmap.h
+++ b/src/heightmap.h
@@ -1,5 +1,7 @@
 /* $Id$ */
 
+/** @file heightmap.h */
+
 #ifndef HEIGHTMAP_H
 #define HEIGHTMAP_H
 
@@ -8,12 +10,15 @@
  * Otherwise you will get inconsistent behaviour.
  */
 enum {
-	HM_COUNTER_CLOCKWISE, //! Rotate the map counter clockwise 45 degrees
-	HM_CLOCKWISE,         //! Rotate the map clockwise 45 degrees
+	HM_COUNTER_CLOCKWISE, ///< Rotate the map counter clockwise 45 degrees
+	HM_CLOCKWISE,         ///< Rotate the map clockwise 45 degrees
 };
 
 /**
  * Get the dimensions of a heightmap.
+ * @param filename to query
+ * @param x dimension x
+ * @param y dimension y
  * @return Returns false if loading of the image failed.
  */
 bool GetHeightmapDimensions(char *filename, uint *x, uint *y);
@@ -22,11 +27,13 @@ bool GetHeightmapDimensions(char *filena
  * Load a heightmap from file and change the map in his current dimensions
  *  to a landscape representing the heightmap.
  * It converts pixels to height. The brighter, the higher.
+ * @param filename of the heighmap file to be imported
  */
 void LoadHeightmap(char *filename);
 
 /**
  * Make an empty world where all tiles are of height 'tile_height'.
+ * @param tile_height of the desired new empty world
  */
 void FlatEmptyWorld(byte tile_height);