Update README.md

README.md

@@ -6,5 +6,14 @@ Repository contains the generator class and two macros showing various usage
 
 ### Building / Installation
 
-Generator is a ROOT based class compiled on-the-fly, the macros are ment to run in ROOT. Supproted versions are ROOT5 and ROOT6
-
+Generator is a ROOT based class compiled on-the-fly, the macros are ment to run in ROOT. Supported versions are ROOT5 and ROOT6
+
+### Running
+
+root runBreakup.C
+
+This is an afterburner generator an input file with theory curves: one-arm coherent VM photoproduction cross section and invariant mass histogram, are expected. An example file for testing purposes is provided.
+
+See/Use run macro (runBreakup.C) to execute the generator. There are two sub-functions you may use:
+- runStandaloneGenerator(): This method by default runs generation of events based on the theory input. 
+- computeModelBreakups(): This method using the same theory input as in the previous method will produce the cross section predictions as on Fig.14 in the paper