diff --git a/RULESET.md b/RULESET.md
index 8f5c564..f2e7a02 100644
--- a/RULESET.md
+++ b/RULESET.md
@@ -12,6 +12,8 @@
 - The world is a 256x256 grid of tiles called quadrants
 
 ### Quadrants
+
+#### Types
 - Empty - 30% chance
 - Asteroid field - 10% chance
 - Star system - 10% chance
@@ -24,6 +26,11 @@
 - Anomaly - 4% chance
 - Singularity - 1% chance
 
+- Every quadrant has three boolean values:
+    - Visited - Whether the player has visited the quadrant
+    - Discovered - Whether the player has discovered the quadrant (and is visible on map)
+    - Old - Whether the quadrant is old, effects differ. Every quadrant has a 20% chance of being old.
+
 ### Wormholes
 
 - When entering a black hole, the player is teleported to a random white hole. If there are no white holes, the player is teleported to a random quadrant.