diff --git a/README.md b/README.md
index dc28b16..fd04055 100644
--- a/README.md
+++ b/README.md
@@ -12,8 +12,11 @@ cd lib/sw_apps/zynq_fsbl/src/ && make BOARD=zed CFLAGS=-DFSBL_DEBUG_INFO
 Requirements [TBC]:
 - cmake
 - arm-none-eabi-gcc
-- doxygen
+- doxygen 
+- graphviz
 
+Configure doxygen:
+- export DOT_PATH=/usr/local/bin
 
 satisfy Rust requirements 
 ```sh