diff --git a/CHANGELOG.md b/CHANGELOG.md
index 849f964..eb7c434 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,12 +2,19 @@
 
 - New: Fragmentation upgrade for projectile weapons
 - New: Swiftness upgrade for melee weapons
-- WIP: Beam upgrade for hitscan weapons
-  - currently disabled due to bad interactions with other weapons
+- New: Acid elemental tree
+  - Corrosive Shots adds a weak dot that gets more powerful as the target takes damage;
+    it works best with slow-firing, high-damage weapons like the rockets and SSG
+  - Acid Spray causes surplus acid to splash onto nearby enemies
+  - Embrittlement makes acid stacks increase damage taken by enemies
+  - Explosive Reaction turns acid stacks into an explosion on death
 - Fix: Infinite recursion with some upgrade combinations
 - Fix: Weakness upgrade could sometimes give enemies damage resistance.
 - Change: Documentation tweaks.
 - Change: Redesign of damage-over-time API to support fractional stacks/durations.
+- Change: Fire now applies stacks based on attack damage.
+- WIP: Beam upgrade for hitscan weapons
+  - currently disabled due to bad interactions with other weapons
 
 # 0.5.2
 
diff --git a/Makefile b/Makefile
index a171100..ac3c50e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-VERSION="0.5.2"
+VERSION="0.6.0"
 PK3=release/Laevis-${VERSION}.pk3
 LUMPS=MAPINFO CVARINFO KEYCONF MENUDEF LANGUAGE.* sprites/
 ZSCRIPT=$(patsubst %.zs,%.zsc,$(shell find . -name "*.zs"))
diff --git a/ca.ancilla.laevis/upgrades/Acid.zs b/ca.ancilla.laevis/upgrades/Acid.zs
index e4ed4fb..ccf650d 100644
--- a/ca.ancilla.laevis/upgrades/Acid.zs
+++ b/ca.ancilla.laevis/upgrades/Acid.zs
@@ -209,7 +209,6 @@ class ::AcidSpray::Aux : Actor {
   }
 
   uint GetRange() {
-    DEBUG("GetRange: %d", 32 + level*16);
     return 32 + level*16;
   }
 
diff --git a/ca.ancilla.laevis/upgrades/Fire.zs b/ca.ancilla.laevis/upgrades/Fire.zs
index 9d71cf8..dc1599f 100644
--- a/ca.ancilla.laevis/upgrades/Fire.zs
+++ b/ca.ancilla.laevis/upgrades/Fire.zs
@@ -24,7 +24,7 @@ class ::IncendiaryShots : ::BaseUpgrade {
   override void OnDamageDealt(Actor player, Actor shot, Actor target, int damage) {
     if (!shot) return;
     // TODO: softcap support
-    ::Dot.GiveStacks(player, target, "::FireDot", level);
+    ::Dot.GiveStacks(player, target, "::FireDot", level*damage*0.2);
   }
 
   override bool IsSuitableForWeapon(TFLV::WeaponInfo info) {