Update README.md

Author: Lukas9318

README.md

@@ -45,7 +45,7 @@ In the datesets directory in the repository from github are index files with nam
  CMS_Run2010B_Commissioning_AOD_Apr21ReReco-v1_0003_file_index.txt
  CMS_Run2010B_Commissioning_AOD_Apr21ReReco-v1_0004_file_index.txt   
 
-These index files are the same as you can find in the open data portal record http://opendata.cern.ch/record/2 , they are copied here for convenience and also for details of the analysis you can read comments in the analysis code DemoAnalyzer.cc .        
+These index files are the same as you can find in the open data portal record http://opendata.cern.ch/record/2 , they are copied here for convenience and for details of the analysis you can read comments in the analysis code DemoAnalyzer.cc .        
 It necessary to note that whole analysis can take around 8 hours! 
 
 When you rerun for all four index files you should have four root files with names: