diff --git a/README.md b/README.md
index afedb9f..5f5375d 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 ### Contents ###
 
-This is the C++ source code for the musrSim simulation software which is intended to be a general tool to design and simulate µSR spectrometer with very high accuracy. To compile and run musrSim, the user must have a recent Geant4 (tested with v11.0.3) and Root (tested with v6-22-06) installed (Root version is not critical). 
+This is the C++ source code for the musrSim simulation software which is intended to be a general tool to design and simulate µSR spectrometer with very high accuracy. To compile and run musrSim, the user must have a recent Geant4 (tested with v11.0.3 and v11.2.0) and Root installed (tested with v6-22-06 and v6-30-02, but the version should not be critical). 
 
 * The code is specifically tuned to simulate muon spin spectrometers.
 * The code is maintained by the Laboratory for Muon Spin Spectroscopy at PSI.
@@ -15,25 +15,29 @@ This is the C++ source code for the musrSim simulation software which is intende
 
 Compile and install Geant4, we recommend the use of the following cmake flags
 
-    cmake -DCMAKE_INSTALL_PREFIX=/path/to/installation /path/to/source -DGEANT4_USE_QT=ON -DGEANT4_INSTALL_DATA=ON -DGEANT4_USE_OPENGL_X11=ON
+    cmake -DCMAKE_INSTALL_PREFIX=/path/to/G4installation /path/to/G4source -DGEANT4_USE_QT=ON -DGEANT4_INSTALL_DATA=ON -DGEANT4_USE_OPENGL_X11=ON
 
 We also recommend that you use `view3dscene` as a VRML viewer. This can be downloaded from here: `https://castle-engine.io/view3dscene.php`.
 
-Following the installation of Gean4, set the correct environment variable. We recommend that you add the following to your `.bashrc` file.
+Following the installation of Gean4, set the correct environment variables. This can be done easily by editing `/path/to/G4installation/bin/geant4.sh` to uncomment the lines defining Geant4 data location:
 
-    export G4INSTALL="/path/to/installation" 
-    export G4NEUTRONHPDATA="$G4INSTALL/share/Geant4-11.0.3/data/G4NDL4.6"
-    export G4LEDATA="$G4INSTALL/share/Geant4-11.0.3/data/G4EMLOW8.0"
-    export G4LEVELGAMMADATA="$G4INSTALL/share/Geant4-11.0.3/data/PhotonEvaporation5.7"
-    export G4RADIOACTIVEDATA="$G4INSTALL/share/Geant4-11.0.3/data/RadioactiveDecay5.6"
-    export G4PARTICLEXSDATA="$G4INSTALL/share/Geant4-11.0.3/data/G4PARTICLEXS4.0"
-    export G4PIIDATA="$G4INSTALL/share/Geant4-11.0.3/data/G4PII1.3"
-    export G4REALSURFACEDATA="$G4INSTALL/share/Geant4-11.0.3/data/RealSurface2.2"
-    export G4SAIDXSDATA="$G4INSTALL/share/Geant4-11.0.3/data/G4SAIDDATA2.0"
-    export G4ABLADATA="$G4INSTALL/share/Geant4-11.0.3/data/G4ABLA3.1"
-    export G4INCLDATA="$G4INSTALL/share/Geant4-11.0.3/data/G4INCL1.0"
-    export G4ENSDFSTATEDATA="$G4INSTALL/share/Geant4-11.0.3/data/G4ENSDFSTATE2.3"
-    export G4VRMLFILE_VIEWER="/path/to/your/view3dscene";
+    export G4NEUTRONHPDATA=$GEANT4_DATA_DIR/G4NDL4.7
+    export G4LEDATA=$GEANT4_DATA_DIR/G4EMLOW8.5
+    export G4LEVELGAMMADATA=$GEANT4_DATA_DIR/PhotonEvaporation5.7
+    export G4RADIOACTIVEDATA=$GEANT4_DATA_DIR/RadioactiveDecay5.6
+    export G4PARTICLEXSDATA=$GEANT4_DATA_DIR/G4PARTICLEXS4.0
+    export G4PIIDATA=$GEANT4_DATA_DIR/G4PII1.3
+    export G4REALSURFACEDATA=$GEANT4_DATA_DIR/RealSurface2.2
+    export G4SAIDXSDATA=$GEANT4_DATA_DIR/G4SAIDDATA2.0
+    export G4ABLADATA=$GEANT4_DATA_DIR/G4ABLA3.3
+    export G4INCLDATA=$GEANT4_DATA_DIR/G4INCL1.2
+    export G4ENSDFSTATEDATA=$GEANT4_DATA_DIR/G4ENSDFSTATE2.3
+
+Then run the following to setup the correct variables
+
+    . /path/to/G4installation/bin/geant4.sh
+
+You will probably need to do that everytime you want to run the simulation or add the line above to your `.bashrc`.
 
 Clone the musrSim repository
 
@@ -52,7 +56,7 @@ This will install the `musrSim` binary in `/usr/local/bin`, but it can be moved
 
 ### Running the simulations ###
 
-Prepare a file, `finlename.mac`, with your beamline and spectrometer design following the instruction in the [musrSim manual](https://bitbucket.org/zaher-salman/musrsim/src/master/doc/musrSim.pdf).
+Prepare a file, `finlename.mac`, with your beamline and spectrometer design following the instruction in the [musrSim manual](https://bitbucket.org/zaher-salman/musrsim/src/master/doc/musrSim.pdf). Create a folder `data` and then run the simulation 
 
     musrSim filename.mac