diff --git a/Examples/Example4/README b/Examples/Example4/README
index 356303d052346d18225bebdc9b27dafaf7ca9838..e6ce692765aef0369f9b1afadc71eb24440bbac9 100644
--- a/Examples/Example4/README
+++ b/Examples/Example4/README
@@ -60,7 +60,15 @@ RecoVisu= 1
 If this is the case run the hclient.C macro in another terminal's window.
 A canvas should appear with the found tracks and their 3D fit.
 
-3. MACRO
+3. PARRALLEL SIMULATION AND ANALYSIS
+
+On a multicore machine the simulation and analysis could be run using the provided Snakefile.
+The top section of the Snakefile create a given number of output target file. Adding more file will 
+run the simulation on more cores. Each file is created with a different random generator seed
+
+The analysis is run as soon as the simulation is finished.
+
+4. MACRO
 Sevaral root macro are located in Example4/macro to check the result of the analysis
 and the obtained vertex, angular and energy resolution.