Update README2.asciidoc

README2.asciidoc

@@ -20,13 +20,17 @@ We recommend to use Macports or Homebrew to install the required software. Below
 is a recipe for Macports. 
 
 ----
-sudo port install nodejs12 <1>
-sudo port install asciidoctor
-sudo port select --set ruby ruby24
-sudo gem install asciidoctor-katex
-sudo port install dblatex
+sudo port install asciidoctor       # <1>
+sudo port select --set ruby ruby24  # <2>
+sudo port install nodejs12          # <3>
+sudo gem install asciidoctor-katex  # <4>
+sudo port install dblatex           # <5>
 ----
-<1> test
+<1> Install Asciidoctor and dependencies. One dependency is Ruby.
+<2> Select Ruby from Macports as default. Otherwise `/usr/bin/ruby` would be used.
+<3> Install Node.js 12. Version 13 should work as well but has not been tested.
+<4> Install KaTeX plugin for Asciidoctor. This must be installed as Gem since Macports doesn't provide it.
+<5> Install the Docbook XML to LaTeX translater plus all requirements - include TeX and LaTeX
 
 ### Ubuntu 18+