diff --git a/src/micropolisj/engine/TileConstants.java b/src/micropolisj/engine/TileConstants.java
index 047580d..53c1d98 100644
--- a/src/micropolisj/engine/TileConstants.java
+++ b/src/micropolisj/engine/TileConstants.java
@@ -10,6 +10,30 @@ package micropolisj.engine;
import java.util.Arrays;
+/**
+ * Contains symbolic names of certain tile values,
+ * and helper functions to test tile attributes.
+ * Attributes of tiles that are interesting:
+ *
+ * - ZONE - the special tile for a zone
+ *
- ANIM - the tile animates
+ *
- BULL - is bulldozable
+ *
- BURN - is combustible
+ *
- COND - can conduct power
+ *
- Road - traffic
+ *
- Rail - railroad
+ *
- Floodable - subject to floods
+ *
- Wet
+ *
- Rubble
+ *
- Tree
+ *
- OverWater
+ *
- Arsonable
+ *
- Vulnerable - vulnerable to earthquakes
+ *
- Bridge
+ *
- AutoDozeRRW - automatically bulldoze when placing Road/Rail/Wire
+ *
- AutoDozeZ - automatically bulldoze when placing Zone
+ *
+ */
public class TileConstants
{
//
@@ -57,7 +81,7 @@ public class TileConstants
public static final char HTRFBASE = 144;
public static final char LASTROAD = 206;
public static final char POWERBASE = 208;
- public static final char HPOWER = 208;
+ public static final char HPOWER = 208; //underwater power-line
public static final char VPOWER = 209;
public static final char LHPOWER = 210;
public static final char LVPOWER = 211;