diff --git a/emu_war_online_3.myco b/emu_war_online_3.myco
index 2ef38a8..3461c60 100644
--- a/emu_war_online_3.myco
+++ b/emu_war_online_3.myco
@@ -8,7 +8,12 @@ Features implemented:
 ** EWO3 is turn-based, but with about 20 turns per second.
 ** Players have no walking speed limit but enemies do (though they move somewhat randomly).
 * Procedural worldgen.
-** Currently limited to a few "rocky outcrops" which obstruct movement.
+** Base worldgen is simplex noise. Height is indicated with slightly-slow-to-traverse contour 
+** River "simulation" and lakes/rivers.
+*** Physical plausibility isn't real, so the rivers A*-path themselves down to the seas or lakes.
+*** They run from sources at the tallest points with sufficient separation (found greedily).
+*** Terrain near the river centre-line is flooded and eroded somewhat. Valleys don't really work properly due to bad.
+** The world is an island surrounded by ocean.
 * Digging holes (as minor obstruction).
 * Items (dirt, bones).
 ** Dirt is from digging.
@@ -35,10 +40,6 @@ Planned:
 ** Maybe you can selectively breed them. It should not be that hard to give crops genetics.
 ** Trees (for a few other resources) are bigger and somewhat more obstructive crops.
 *** With dropbears (authentic Australia).
-* Worldgen rework.
-** Contour lines for height rather than rocky areas.
-** River "simulation" and lakes/rivers.
-** The world is an island surrounded by ocean.
 * Basilisk (boss-ish enemy).
 ** Occupies multiple tiles.
 ** Starts unfinished. Asks players to feed it resources to grow with promise of rewards and threats.