diff --git a/README.md b/README.md
index 8bba4e1..d9cc2d5 100644
--- a/README.md
+++ b/README.md
@@ -140,6 +140,8 @@ Install
     make check # run tests
     sudo make install
 
-
+### Enable Graphviz
+
+    ./configure --enable-graphviz