diff --git a/Rakefile b/Rakefile
index 4111429..3b5a3c1 100644
--- a/Rakefile
+++ b/Rakefile
@@ -33,10 +33,15 @@ names.each do |name|
   sch = "#{name}.sch"
   # pcb layout
   pcb = "#{name}.pcb"
-  # schematic revision, based on the number of schematic commits
-  sch_rev = `git log --pretty=oneline "#{sch}" | wc -l`.chomp.to_i
-  # pcb layout revision, based on the number of pcb commits
-  pcb_rev = `git log --pretty=oneline "#{pcb}" | wc -l`.chomp.to_i
+  # get common schematic/layout revision number, based on the total number of commits
+  # this means the layout revision number can increment although only the schematic has been modified (and vice versa), but this is more convenient to have synched revision numbers
+  rev =  `git log --pretty=oneline "#{sch}" "#{pcb}" | wc -l`.chomp.to_i
+  sch_rev = rev
+  pcb_rev = rev
+  # get schematic and layout revision numbers, based on the respective number of commits
+  # this allows to have independent number in case an edit in one does not affect the other, but you need to keep track of which revision numbers correspond
+  #sch_rev = `git log --pretty=oneline "#{sch}" | wc -l`.chomp.to_i
+  #pcb_rev = `git log --pretty=oneline "#{pcb}" | wc -l`.chomp.to_i
   # schema name with version and revision
   vsch = "#{name}_v#{version}.#{sch_rev.to_s.rjust(3,'0')}.sch"
   # pcb layout name with version and revision
@@ -319,8 +324,8 @@ end
 desc "generate printable documentation (PDF) from layout"
 targets.each do |target|
   file "#{target[:name]}_layout.pdf" => target[:vpcb] do |t|
-    sh "pcb -x ps --psfile #{t.name}.ps #{t.prerequisites.join(' ')} 2> /dev/null"
-    sh "ps2pdf #{t.name}.ps #{t.name} 2> /dev/null"
+    sh "pcb -x ps --media A4 --psfile #{t.name}.ps #{t.prerequisites.join(' ')} 2> /dev/null"
+    sh "ps2pdf -sPAPERSIZE=a4 #{t.name}.ps #{t.name} 2> /dev/null"
     sh "rm #{t.name}.ps 2> /dev/null"
   end
 end