diff --git a/source/ChunkDef.h b/source/ChunkDef.h
index 1e368b50..7f9c0ca9 100644
--- a/source/ChunkDef.h
+++ b/source/ChunkDef.h
@@ -118,7 +118,7 @@ public:
 
 	static const unsigned int INDEX_OUT_OF_RANGE = 0xffffffff;
 
-	/// The type used for any heightmap operations and storage; idx = x + Width * z
+	/// The type used for any heightmap operations and storage; idx = x + Width * z; Height points to the highest non-air block in the column
 	typedef HEIGHTTYPE HeightMap[Width * Width];
 	
 	/** The type used for any biomemap operations and storage inside MCServer, 
diff --git a/source/Generating/ChunkDesc.cpp b/source/Generating/ChunkDesc.cpp
index 68feb463..ff331e6e 100644
--- a/source/Generating/ChunkDesc.cpp
+++ b/source/Generating/ChunkDesc.cpp
@@ -547,3 +547,30 @@ void cChunkDesc::CompressBlockMetas(cChunkDef::BlockNibbles & a_DestMetas)
 
 
 
+
+#ifdef _DEBUG
+
+void cChunkDesc::VerifyHeightmap(void)
+{
+	for (int x = 0; x < cChunkDef::Width; x++)
+	{
+		for (int z = 0; z < cChunkDef::Width; z++)
+		{
+			for (int y = cChunkDef::Height - 1; y > 0; y--)
+			{
+				if (GetBlockType(x, y, z) != E_BLOCK_AIR)
+				{
+					ASSERT(GetHeight(x, z) == y);
+					break;
+				}
+			}  // for y
+		}  // for z
+	}  // for x
+}
+
+#endif  // _DEBUG
+
+
+
+
+
diff --git a/source/Generating/ChunkDesc.h b/source/Generating/ChunkDesc.h
index a25d0a72..bc952fbe 100644
--- a/source/Generating/ChunkDesc.h
+++ b/source/Generating/ChunkDesc.h
@@ -183,6 +183,11 @@ public:
 	/// Compresses the metas from the BlockArea format (1 meta per byte) into regular format (2 metas per byte)
 	void CompressBlockMetas(cChunkDef::BlockNibbles & a_DestMetas);
 	
+	#ifdef _DEBUG
+	/// Verifies that the heightmap corresponds to blocktype contents; if not, asserts on that column
+	void VerifyHeightmap(void);
+	#endif  // _DEBUG
+	
 private:
 	int m_ChunkX;
 	int m_ChunkZ;