diff --git a/terrain.cc b/terrain.cc
index c6190ae..90bd462 100644
--- a/terrain.cc
+++ b/terrain.cc
@@ -11,17 +11,17 @@ void Terrain::load() {
     std::ifstream terrain_png(this->filePath);
     unsigned int width, height, rowNum, columnNum;
 
-    terrain_png.seekg(16);
-    terrain_png.read((char *)&width, 4);
-    terrain_png.read((char *)&height, 4);
-    width = ntohl(width);
-    height = ntohl(height);
+    terrain_png.seekg(16);			//skip part of the header
+    terrain_png.read((char *)&width, 4);	//read width
+    terrain_png.read((char *)&height, 4);	//read height
+    width = ntohl(width);			//convert from host to network byte order
+    height = ntohl(height);			
 
-    heightmap = new unsigned int*[height];
-    for(rowNum=0; rowNum<height; rowNum++){
-	heightmap[columnNum] = new unsigned int[width];
+    heightmap = new unsigned int*[height];	//initialize the heightmap
+    for(rowNum=0; rowNum<height; rowNum++){	//read in the heightmap
+	heightmap[rowNum] = new unsigned int[width];
 	for(columnNum=0; columnNum<width; columnNum++){
-	    terrain_png.read((char *)&heightmap[columnNum][rowNum], 1);
+	    terrain_png.read((char *)&heightmap[rowNum][columnNum], 1);
 	}
     }
     
diff --git a/terrain.hh b/terrain.hh
index 9dafe5a..07a85be 100644
--- a/terrain.hh
+++ b/terrain.hh
@@ -4,9 +4,7 @@
 #include <string>
 #include "texture.hh"
 #include <fstream>
-#include <iostream>
-#include "png.h"
-//#include <winsock.h>		//on windows
+//#include <winsock.h>		//on Windows
 #include <netinet/in.h>		//on Unix
 
 class Terrain {
@@ -19,7 +17,7 @@ class Terrain {
         float friction;
         Texture texture;
         std::string filePath;
-	unsigned int** heightmap;
+	unsigned int** heightmap;	//can be accessed like 'unsigned int[][]'
 };
 
 #endif