diff --git a/rdd-technical-reference.md b/rdd-technical-reference.md
index 6c1511f3211851de2209d3e7ca6519b37a997152..1703cb0deff4d2c6c94e31073293394f1900e366 100644
--- a/rdd-technical-reference.md
+++ b/rdd-technical-reference.md
@@ -59,13 +59,15 @@ the department.
     - declaration of variables should start with a **?** (and not with a **$**).
     - opening parenthesis **{** should be at the end of the line. Closing parenthesis in a separate line.
 
-'''
+```
 SELECT * WHERE {
     ?s ?p ?o .
 } LIMIT 10
-'''
+```
 
+'''
     - group concatenations in SELECT command should be in seperate lines.
+'''
 
 ```
 PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
diff --git a/rdd-technical-reference.pdf b/rdd-technical-reference.pdf
index cd728e372f17cc29712606304d1eced2ab0b44e5..09b68fe1d26af19c5520c24103cb173e2ab8fd8c 100644
Binary files a/rdd-technical-reference.pdf and b/rdd-technical-reference.pdf differ