diff --git a/better-air-filtering/changelog.txt b/better-air-filtering/changelog.txt
index 5b4aa74..5344413 100644
--- a/better-air-filtering/changelog.txt
+++ b/better-air-filtering/changelog.txt
@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.3.3
+Date: 2021.03.09
+  Performance:
+    - Merge pull request by AngledLuffa to optimize code for pollution suction (https://github.com/JoeyDP/Factorio-Better-Air-Filtering/pull/2).
+---------------------------------------------------------------------------------------------------
 Version: 0.3.2
 Date: 2021.02.05
   Fixes: