diff --git a/README.md b/README.md
index c55a2d2..831fd24 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ _Inspiration was drawn from the original Av1an (python) boosting code_
 ## Version 2.0: SSIMULACRA2-based
 
 > Does a fast encode of the provided file, calculates SSIMULACRA2 scores of each chunks and adjusts CRF per-scene to be closer to the average total score, in a _zones.txt_ file to feed Av1an.
-The requirements are Vapoursynth, vstools, LSMASHSource, fmtconv, Av1an and vapoursynth-ssimulacra2.
+The requirements are Vapoursynth, LSMASHSource, fmtconv, Av1an and vapoursynth-ssimulacra2.
 
 __Usage:__
 ```
@@ -53,6 +53,22 @@ __Known limitations:__
 
 _Borrowed some code from Sav1or's SSIMULACRA2 script_
 
+## Version 2.5: SSIMULACRA2&XPSNR-based
+
+The requirements are Vapoursynth, LSMASHSource, Av1an, vszip and a few python library libraries. Optionally: ffmpeg built with XPSNR support, turbo-metrics.
+
+Refined 2.0 with the following additions & changes:
+- Proper argument parsing, more control over the script
+- Separated the fast encode, metric calculation and zone creation into three independant, callable stages
+- Replaced the deprecated `vapoursynth-ssimulacra2` by `vszip`
+- Added `turbo-metrics` for GPU-accelerated metrics measurement (Nvidia only)
+- Added XPSNR metric and a few zones calculation methods
+- Taking advantage of SVT-AV1-PSY quarter-step CRF feature for more granular control
+- Possibility to use a more aggressive boosting curve
+- And a few other smaller changes...
+
+_Many thanks to R1chterScale, Yiss and Kosaka for iterating on auto-boost and making these amazing contributions!_
+
 ## Version 3.0: SSIMULACRA2-based + per-scene grain synthesis strength determination
 
 ...and a few other improvements.