diff --git a/README.org b/README.org
index 3e9bb2e..ee05316 100644
--- a/README.org
+++ b/README.org
@@ -22,7 +22,7 @@ opportunity to learn about computers, files, directories and programs.
 ** Users
 
  * [[./tutorial/add_user.org][How to add users]]
- * [[./tutorial/changeowner.org][Changing file permissions: 'chmod']]
+ * [[./tutorial/changeowner.org][Changing file permissions: 'chmod' and 'chown']]
 
 ** File manipulation
 
@@ -36,7 +36,7 @@ opportunity to learn about computers, files, directories and programs.
 ** File conversion
 
  * [[./tutorial/convertppt2pdf.org][Convert office files to pdf]]
- * [[./tutorial/poppler.org][Convert markup text to multiple formats using 'pandoc']]
+ * [[./tutorial/pandoc.org.org][Convert markup text to multiple formats using 'pandoc']]
  * [[./tutorial/poppler.org][Convert pdf to text or html using 'poppler']]
  * [[./tutorial/video_convert.org][Convert videos]]
 
diff --git a/tutorial/poppler.org b/tutorial/poppler.org
index cb9b844..3c98dff 100644
--- a/tutorial/poppler.org
+++ b/tutorial/poppler.org
@@ -5,24 +5,23 @@
 Use poppler and redirect the text to a org file. ~pdftotext~ converts a pdf to
 "txt" if no other format is specified
 
-#+begin_src bash
+#+begin_example bash
   pdftotext foo.pdf foo
-#+end_src
+#+end_example
 
 Install poppler in Parabola GNU-Linux
 
-#+begin_src bash
+#+begin_example bash
   pacman -S poppler
-#+end_src
+#+end_example
 
-#+begin_src bash
+#+begin_example bash
  pdftotext foo.pdf ->> foo.org # first option
  pdftotext foo.pdf foo.org # second option
-#+end_src
+#+end_example
 
 Convert pdf to html
 
-#+begin_src bash
- pfdftohtml foo.pdf foo.html
-#+end_src
-
+#+begin_example bash
+  pfdftohtml foo.pdf foo.html
+#+end_example