diff --git a/applications/apertif/doc/apertif_fpga_firmware_overview_erko.txt b/applications/apertif/doc/apertif_fpga_firmware_overview_erko.txt
index 512b4840291d9e960d2657ea8acb140c9cc4deae..2b53e5a0f25b84ad444678b2681ae49297eafc86 100755
--- a/applications/apertif/doc/apertif_fpga_firmware_overview_erko.txt
+++ b/applications/apertif/doc/apertif_fpga_firmware_overview_erko.txt
@@ -5,6 +5,7 @@ $RADIOHDL/applications/apertif/designs/
   > cd $RADIOHDL/libraries/technology/ip_stratixiv
   > ./generate-all-ip.sh
   
+
 2) Revisions:
   "apertif_unb1_bn_filterbank"       = apertif_unb1_bn_filterbank/src/vhdl/apertif_unb1_bn_filterbank.vhd
   "apertif_unb1_fn_beamformer_trans" = apertif_unb1_fn_beamformer/revisions/apertif_unb1_fn_beamformer_transpose/apertif_unb1_fn_beamformer_transpose.vhd
@@ -15,20 +16,12 @@ $RADIOHDL/applications/apertif/designs/
    apertif_unb1_fn_beamformer/src/vhdl/apertif_unb1_fn_beamformer.vhd
    apertif_unb1_correlator/src/vhdl/apertif_unb1_correlator_nodes.vhd
 
+
 3) MMM
    sopc_apertif_unb1_bn_filterbank instantiated in mmm as entity
    sopc_apertif_unb1_fn_beamformer instantiated in mmm as entity
    qsys_apertif_unb1_correlator    instantiated in mmm as component
  
-  Arts:
-  > run_sopc unb1 apertif_unb1_fn_bf_emu
-  > run_qsys unb1 arts_unb1_sc1
-  
-  Apertif:
-  > run_sopc unb1 apertif_unb1_bn_filterbank
-  > run_sopc unb1 apertif_unb1_fn_beamformer_trans
-  > run_qsys unb1 apertif_unb1_correlator_full
-  
   MMM automation is still in trial status, so not used for applications yet:
   * DS: base/generate_qsys.py creats a *.sys file from a template and a register list
         components/mm_master.py
@@ -40,9 +33,21 @@ $RADIOHDL/applications/apertif/designs/
 4) Build:
   > python $RADIOHDL/tools/oneclick/base/modelsim_config.py -t unb1
   > python $RADIOHDL/tools/oneclick/base/quartus_config.py -t unb1
+
+  Arts:
+  > run_sopc unb1 apertif_unb1_fn_bf_emu
+  > run_qsys unb1 arts_unb1_sc1
+  
+  Apertif:
+  > run_sopc unb1 apertif_unb1_bn_filterbank
+  > run_sopc unb1 apertif_unb1_fn_beamformer_trans
+  > run_qsys unb1 apertif_unb1_correlator_full
+    
+  Run qsys_delete_duplicates_*.sh to avoid ambigious duplicate source file error with QSYS in Quartus:
+  > cd $RADIOHDL/applications/apertif/designs/apertif_unb1_correlator/revisions/apertif_unb1_correlator_full
+  > ./qsys_delete_duplicates_full.sh
+  > cd $RADIOHDL
   
-   Run qsys_delete_duplicates_*.sh
-  ./applications/apertif/designs/apertif_unb1_correlator/revisions/apertif_unb1_correlator_full/qsys_delete_duplicates_full.sh
 
 5) Simulate
 
@@ -53,6 +58,7 @@ $RADIOHDL/applications/apertif/designs/
   > mk all
   > lp apertif_unb1_correlator
   > mk all
+
   
 6) Synthesis
  python ~/svnroot/UniBoard_FP7/RadioHDL/trunk/tools/oneclick/base/quartus_config.py -t unb1
@@ -72,3 +78,58 @@ $RADIOHDL/applications/apertif/designs/
 
  ls
  ll
+
+
+7) SVN branching
+
+ mkdir branches
+ svn add branches/
+ commit -m "Start branching." branches/
+ svn info .
+ # The ^ is the root of the repository in SVN
+ svn ls ^/RadioHDL
+
+ # Define simple editor for SVN commit message editing
+ export SVN_EDITOR=vim
+ echo $SVN_EDITOR
+
+ # Create branch from revison 16579 of the trunk and call it Task_<Redmine issue number>
+ # Start the commit message with Task #<Redmine issue number>: to provide link for Redmine.
+ # Optinal use r<SVN revision number> in the commit message
+
+ svn cp ^/RadioHDL/trunk@16579 ^/RadioHDL/branches/Task_1275
+ cd branches
+ svn up Task_1275
+ 
+ rbf:17728 resynthesis of Hajee image 16579 on Task_1275 branch works OK.
+ 
+ cd ~/svnroot/UniBoard_FP7/RadioHDL/branches/Task_1275
+ diff -r  . ../../trunk_hajee       # shows diff inside files
+ diff -rq . ../../trunk_hajee       # quiet, shows only diff files names
+ 
+ cntr-alt-F1
+ killall -9 gvimdiff
+ cntr-alt-F7
+ 
+ cd ../branches/Task_1275/
+ svn log -v -r 16588:HEAD ^/RadioHDL/trunk | more
+ svn merge -c 16592 ^/RadioHDL/trunk     # merge changes
+ svn merge -r 16596:16658 ^/RadioHDL/trunk     # merge a range of revisions
+ svn diff --diff-cmd diff   # toont Merged /RadioHDL/trunk:r16580-16592
+ 
+8) To do:
+ - ppsh.vhd decrease c_pipeline_output : NATURAL := 100;
+ 
+9) Task_1275
+ Possible suspects: WPFB, ADUH, node, PPSH, DP
+ r 17739 : Merged /RadioHDL/trunk:r16580-16658 and compaan stuff
+ r ..... : Merged technology, base, io (so including ppsh, aduh)
+           > cd technology
+           > svn merge ^/RadioHDL/trunk/libraries/technology
+           > cd base
+           > svn merge ^/RadioHDL/trunk/libraries/base
+           > cd io
+           > svn merge ^/RadioHDL/trunk/libraries/io
+ 
+ 
+ 
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