diff --git a/README.md b/README.md
index 87650fa1232480cc9596afe03f90735d5e7c7954..48a33478b4d75bef9e0c2296d4a6beac147026c5 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ For building this project in both Windows and Linux the following tools must be
 - [cmake](https://cmake.org/download/): Download .msi file and execute it.
 - [swig](http://www.swig.org/survey.html): Download the .zip and unzip it. Include the folder into `path` environemnt variable.
 - [doxygen](https://www.doxygen.nl/download.html): Download .exe file and execute it.
+- [graphviz](https://www.graphviz.org/download/): Download 64 bit .exe installer and execute it.
 - [python 3.7.9](https://www.python.org/downloads/release/python-379/): Download .msi file and execute it.
 
 ## Linux