diff --git a/src/micropolisj/engine/ZoneStatus.java b/src/micropolisj/engine/ZoneStatus.java
index 8e89d30..0f7f6b6 100644
--- a/src/micropolisj/engine/ZoneStatus.java
+++ b/src/micropolisj/engine/ZoneStatus.java
@@ -8,12 +8,23 @@
 
 package micropolisj.engine;
 
+/**
+ * Contains the information generated by the query tool.
+ * The numbers have very limited use, they are interpreted directly
+ * by the showZoneStatus() method of NotificationPane.
+ */
 public class ZoneStatus
 {
+	/** Number from 0 to 27, identifying the type of building. */
 	public int building;
+	/** Number from 1 to 4, 1=Low, 2=Medium, 3=High, 4=Very High. */
 	public int popDensity;
+	/** Number from 5 to 8, 5=Slum, 6=Lower Class, etc. */
 	public int landValue;
+	/** Number from 9 to 12, 9=Safe, 10=Light, 11=Moderate, etc. */
 	public int crimeLevel;
+	/** Number from 13 to 16, 13=None, 14=Moderate, 15=Heavy, etc. */
 	public int pollution;
+	/** Number from 17 to 20, 17=Declining, 18=Stable, etc. */
 	public int growthRate;
 }