diff --git a/lib/rubyx/rubyx_compiler.rb b/lib/rubyx/rubyx_compiler.rb
index a2d3da12..42ceddcf 100644
--- a/lib/rubyx/rubyx_compiler.rb
+++ b/lib/rubyx/rubyx_compiler.rb
@@ -4,11 +4,20 @@ module RubyX
   # There are methods to go from ruby to any of the layers in the system
   # (mainly for testing). ruby_to_binary creates actual binary code
   # for a given platform.
+  # The compiler keeps the vool source as an instance.
+  # To compile several sources, more vool can be added, ie ruby_to_vool
+  # can be called several times.
+  #
+  # All other methods come in pairs, one takes ruby source (those are for testing)
+  # and the other uses the stored vool source for further processing.
+  #
   # Only builtin is loaded, so no runtime , but the compiler
   # can be used to read the runtime and then any other code
   #
   class RubyXCompiler
 
+    attr_reader :vool
+
     # initialize boots Parfait and Risc (ie load Builin)
     def initialize
       Parfait.boot!
@@ -22,9 +31,19 @@ module RubyX
     #
     # A Linker is returned that may be used to create an elf binay
     #
-    # The compiling is done by ruby_to_risc
+    # The compiling is done by to_binary
     def ruby_to_binary(ruby , platform)
-      linker = ruby_to_risc(ruby, platform)
+      ruby_to_vool(ruby)
+      to_binary(platform)
+    end
+
+    # Process previously stored vool source to binary.
+    # Binary code is generated byu calling to_risc, then positioning and calling
+    # create_binary on the linker. The linker may then be used to creat a binary file.
+    # The biary the method name refers to is binary code in memory, or in BinaryCode
+    # objects to be precise.
+    def to_binary(platform)
+      linker = to_risc(platform)
       linker.position_all
       linker.create_binary
       linker
@@ -33,40 +52,49 @@ module RubyX
     # ruby_to_risc creates Risc instructions (as the name implies), but also
     # translates those to the platform given
     #
-    # The higher level translation is done by ruby_to_mom
+    # After creating vool, we call to_risc
     def ruby_to_risc(ruby, platform)
-      mom = ruby_to_mom(ruby)
+      ruby_to_vool(ruby)
+      to_risc(platform)
+    end
+
+    # Process previously stored vool source. First to mom, then to platform.
+    # Translating to platform returns a linker that is returned and can be used
+    # to generate binaries
+    def to_risc(platform)
+      mom = to_mom
       mom.translate(platform)
     end
 
     # ruby_to_mom does exactly that, it transform the incoming ruby source (string)
     # to mom
-    #
-    # the method calls ruby_to_vool to compile the first layer
+    # The vool is stored using ruby_to_vool, and if there was previous source,
+    # this will also be momed
     def ruby_to_mom(ruby)
-      vool_tree = ruby_to_vool(ruby)
-      vool_tree.to_mom(nil)
+      ruby_to_vool(ruby)
+      to_mom
+    end
+
+    # return mom for the previously stored vool source.
+    def to_mom
+      @vool.to_mom(nil)
     end
 
     # ruby_to_vool compiles the ruby to ast, and then to vool
     def ruby_to_vool(ruby_source)
       ruby_tree = Ruby::RubyCompiler.compile( ruby_source )
-      vool_tree = ruby_tree.to_vool
-      vool_tree
+      @vool = ruby_tree.to_vool
     end
 
 
     def self.ruby_to_binary( ruby , platform)
       compiler = RubyXCompiler.new
-      vool_tree = compiler.ruby_to_vool(ruby)
+      compiler.ruby_to_vool(ruby)
 
       # integrate other sources into vool tree
 
-      mom = vool_tree.to_mom(nil)
-      linker = mom.translate(platform)
-      linker.position_all
-      linker.create_binary
-      linker
+      compiler.to_binary(platform)
+
     end
   end
 end