diff --git a/hexagonal/etc/hexagon.png b/hexagonal/etc/hexagon.png
deleted file mode 100644
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diff --git a/hexagonal/etc/ports_and_adapters.png b/hexagonal/etc/ports_and_adapters.png
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diff --git a/hexagonal/etc/ports_and_adapters.xml b/hexagonal/etc/ports_and_adapters.xml
new file mode 100644
index 000000000..0e64414b8
--- /dev/null
+++ b/hexagonal/etc/ports_and_adapters.xml
@@ -0,0 +1 @@
+<mxfile userAgent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.90 Safari/537.36" version="6.0.1.3" editor="www.draw.io" type="device"><diagram name="Page-1">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</diagram></mxfile>
\ No newline at end of file
diff --git a/hexagonal/etc/presentation.html b/hexagonal/etc/presentation.html
index 46e26c550..74361ad27 100644
--- a/hexagonal/etc/presentation.html
+++ b/hexagonal/etc/presentation.html
@@ -60,29 +60,37 @@ Use Hexagonal Architecture pattern
 
 ---
 
-# Diagram
+# Concepts
 
-.center[![Alt text](hexagon.png)]
+* Ports are interfaces
+* The ports that drive the application are called primary ports
+* The ports that are driven by the application are called secondary ports
 
 ---
 
 # Concepts
 
-* Ports are interfaces
-* Adapters are implementations
-* Driver ports vs driven ports
+* Adapters are interface implementations
+* Typically different adapters for testing and production are provided
+
+---
+
+# Diagram
+
+.center[![Alt text](ports_and_adapters.png)]
 
 ---
 
 # Real world examples
 
-* [Apache Isis](https://isis.apache.org/)
+* [Apache Isis](https://isis.apache.org/) builds generic UI and REST API directly from the underlying domain objects
 
 ---
 
-# Implementation example
+# Tutorials
 
-* http://java-design-patterns.com/patterns/hexagonal/
+* Blog http://java-design-patterns.com/blog/build-maintainable-systems-with-hexagonal-architecture/
+* Source code http://java-design-patterns.com/patterns/hexagonal/
 
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