diff --git a/README.md b/README.md
index c210fa1d3bd9ef96d0f6fc12d616c8427bf8fca8..9231950b6c8ae2363b49384371117508d5df5f1d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # ADT2AMAS
 
-Tool for transforming Attack-Defense Trees (ADTrees) into Asynchronous Multi-Agent Systems (AMAS).
+Tool for transforming Attack-Defense Trees (ADTrees) into Asynchronous
+Multi-Agent Systems (AMAS).
 
 # Dependencies
 
@@ -15,4 +16,6 @@ Tool for transforming Attack-Defense Trees (ADTrees) into Asynchronous Multi-Age
 
 # Generate Documentation
 
-To generate the documentation you need to replace the step 3 above by `cmake .. -DBUILD_DOCS=ON`.
+To generate the documentation you need to install
+[Graphviz](http://www.graphviz.org/) and replace the step 3 above by `cmake
+.. -DBUILD_DOCS=ON`.