diff --git a/README.md b/README.md
index 57acda4..0cd8c2d 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 
 You will find lot of benchmarks for PHP frameworks and template engines.
 
-You can compare results between Apache Bench and Siege, and PHP 5.6 to 7.2.
+You can compare results between Apache Bench and Siege, and PHP 5.6 to 7.3.
 
 ## What is this repository?
 
@@ -21,10 +21,20 @@ See all benchmarked Symlex versions on [phpbenchmarks/symlex](https://github.com
 
 You can find how we benchmark on [phpbenchmarks.com](http://www.phpbenchmarks.com/en/benchmark-protocol.html).
 
+## How versions works ?
+
+We do not follow semantic version for this repository. Here is an explanation about our versioning system:
+
+`X` related to Symlex major version (`4` Symlex ^4)
+
+`Y` benchmark type (`1` Hello World, `3` Rest API)
+
+`Z` new version, not just bugfix and could contains BC
+
 ## Benchmarks
 
 You can find all Symlex benchmark results on [phpbenchmarks.com](http://www.phpbenchmarks.com/en/benchmark/symlex.html).
 
 Scores are too low? Do not hesitate to create a pull request, and ask for a new benchmark!
 
-See also [phpbenchmarks.com/en/participate/create-framework-benchmarks.html](http://www.phpbenchmarks.com/en/participate/create-framework-benchmarks.html).
\ No newline at end of file
+See also [phpbenchmarks.com/en/participate/create-framework-benchmarks.html](http://www.phpbenchmarks.com/en/participate/create-framework-benchmarks.html).