Merge pull request #719 from flip111/patch-1

Update installing.asc

Author: ben

book/01-introduction/sections/installing.asc

@@ -85,8 +85,8 @@ In order to be able to add the documentation in various formats (doc, html, info
 
 [source,console]
 ----
-$ sudo yum install asciidoc xmlto docbook2X
-$ sudo apt-get install asciidoc xmlto docbook2x
+$ sudo yum install asciidoc xmlto docbook2X getopt
+$ sudo apt-get install asciidoc xmlto docbook2x getopt
 ----
 
 Additionally, if you're using Fedora/RHEL/RHEL-derivatives, you need to do this