diff --git a/ReadMe.first b/ReadMe.first
index b020918..37686bd 100644
--- a/ReadMe.first
+++ b/ReadMe.first
@@ -29,30 +29,30 @@ Intel MIC compilers (optional)
 ######Source######
 https://gitlab.psi.ch/uldis_l/DKS
 
+######Changes from DKS-1.0.x version######
+DKS is split into three modules that can be enabled/disabled at compile time depending on which software it is used for.
+By default only DKSBase and DKSFFT modules are enabled. In order to install other modules the necessary otion needs to be enabled.
+Supported options are:
+-DENABLE_OPAL option should be enabled if DKS will be used for OPAL
+-DENABLE_MUSR option should be enable if DKS will be used for musrfit
+-DENABLE_PET option should be enabled if DKS will be used for PET image reconstruction
+
+See install instructions for more details on how to enable the necessary options in DKS
+
 ######Install######
+#consult the https://gitlab.psi.ch/uldis_l/DKS/wikis/home for full install isntructions
 
 #clone DKS
 git clone git@gitlab.psi.ch:uldis_l/DKS.git DKS
 
-#set compilers to use
-#supported c++ compilers: g++, icpc, mpicxx whith g++
-#supported c compilers: gcc, icc, mpicc whith gcc
-export CXX_COMPILER=cpp_compiler_name
-export CC_COMPILER=c_compiler_name
+#switch to the desired version (OPTIONAL)
+git checkout DKS-1.1.0
 
-#set dks root directory directory
-cd DKS
-export DKS_ROOT = $PWD
-
-#set build directory
-mkdir $DKS_BUILD_DIR
-cd $DKS_BUILD_DIR
-
-#set install directory
-export DKS_INSTALL_DIR = $DKS_BUILD_DIR #default is /usr/local/
-
-CXX=$CXX_COMPILER CC=$CC_COMPILER cmake -DCMAKE_INSTALL_PREFIX=$DKS_BUILD_DIR $DKS_ROOT
+#configure installation in build directory
+#enable DKS modules to compile -DENABLE_OPAL, -DENABLE_MUSR, -DENABLE_PET
+CXX=<c++ compiler> CC=<c compiler> -DCMAKE_INSTALL_PREFIX=<install dir> <path to DKS source> [-DENABLE_OPAL=1 -DENABLE_MUSR=1 -DENABLE_PET=1] 
 
+#install DKS
 make
 make install