diff -r 89acc8d3d462 -r 327b11ee0914 doc/tutorials/advanced/part02_security.rst
--- a/doc/tutorials/advanced/part02_security.rst	Wed Mar 18 11:29:30 2020 +0100
+++ b/doc/tutorials/advanced/part02_security.rst	Wed Mar 18 11:30:05 2020 +0100
@@ -174,7 +174,7 @@
 Step 2: security propagation in hooks
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-To fullfill the requirements, we have to implement::
+To fullfill the requirements defined earlier, we have to implement:
 
   Also, unless explicity specified, visibility of an image should be the same as
   its parent folder, as well as visibility of a comment should be the same as the
@@ -348,7 +348,7 @@
                                            visibility=u'restricted')
                 photo1 = cnx.create_entity('File',
                                            data_name=u'photo1.jpg',
-                                           data=Binary('xxx'),
+                                           data=Binary(b'xxx'),
                                            filed_under=folder)
 
                 cnx.commit()
@@ -359,7 +359,7 @@
                 # unless explicitly specified
                 photo2 = cnx.create_entity('File',
                                            data_name=u'photo2.jpg',
-                                           data=Binary('xxx'),
+                                           data=Binary(b'xxx'),
                                            visibility=u'public',
                                            filed_under=folder)