diff --git a/rdd-technical-reference.md b/rdd-technical-reference.md
index 8e1a9ab086fd0771497203470c5930d282bc6771..55f54c4bb323b8d605313a1413b3b58d8dfa7841 100644
--- a/rdd-technical-reference.md
+++ b/rdd-technical-reference.md
@@ -48,6 +48,9 @@ general style guides we ask you to follow:
 -   **HTML/CSS**: For HTML/CSS we agreed upon the [Google HTML/CSS Style
     Guide](https://google.github.io/styleguide/htmlcssguide.html). .
     @TODO: How to use in editor?
+- 	**XQuery**: We use the [xqdoc style guide](http://xqdoc.org/xquery-style.pdf) with the following addenda:
+	- use double quotes instead of single quotes
+
 -   **XSLT**: @TODO
 -   **SPARQL**: @TODO
 
diff --git a/rdd-technical-reference.pdf b/rdd-technical-reference.pdf
index 6ebc6e8a6f0caf590095a363598bfc49473dc8ba..70ca0c509370b11086004f1f6679544b6acc21bf 100644
Binary files a/rdd-technical-reference.pdf and b/rdd-technical-reference.pdf differ