diff --git a/README.asc b/README.asc
index 837a1e8cc..e928ac75e 100644
--- a/README.asc
+++ b/README.asc
@@ -27,10 +27,20 @@ Converting to EPub...
 Converting to Mobi (kf8)...
  -- Mobi output at progit.mobi
 Converting to PDF...
- -- PDF  output at progit.pdf
+ -- PDF output at progit.pdf
 ----
 
-You can also use the following commands:
+An alternative to calling the `bundle` command is to call directly the `asciidoctor` command.
+If it is the first time you're building the book, it is necessary to create the _images_ folder and fill it.
+Do the following only once:
+
+----
+$ mkdir images/
+$ cp book/*/images/* images/
+----
+
+Then you can build the book.
+Use the following commands:
 
 ----
 $ asciidoctor-pdf progit.asc