diff --git a/Lectures_my/KT2_2017/Ex2/install_geant.txt b/Lectures_my/KT2_2017/Ex2/install_geant.txt
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+++ b/Lectures_my/KT2_2017/Ex2/install_geant.txt
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+# the path you need to adopt to your system.
+cd /storage
+mkdir Geant4
+cd Geant4
+wget http://cern.ch/geant4/support/source/geant4.10.03.p01.tar.gz
+tar -xvf geant4.10.03.p01.tar.gz
+mkdir geant4.10.3-build/
+cmake -DCMAKE_INSTALL_PREFIX=/storage/Geant4/geant4.10.3-install /storage/Geant4/geant4.10.03.p01  -DGEANT4_INSTALL_DATA=ON
+make -jN
+sudo make install
+
+# now here we finished instalation
+# lets run example
+source /storage/Geant4/geant4.10.3-install/share/Geant4-10.3.1/geant4make/geant4make.sh
+
+cd /storage/Geant4/geant4.10.3-install/share/Geant4-10.3.1/examples/basic/B2/B2a
+make
+exampleB2a run1.mac
+exampleB2a run2.mac