diff --git a/README.md b/README.md
index 0750de3..dc17af8 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,8 @@ Made with and for:
 - TIDAL on Firefox
 
 ### Version history
+- Rev 4
+  - Even less aggressive EQ, even more bassy
 - Rev 3
   - Less aggressive EQ, more bassy
   - Stereo delay lowered