diff --git a/README.org b/README.org
index f8da5a4..4bb1cdf 100644
--- a/README.org
+++ b/README.org
@@ -2,7 +2,7 @@
 
 * Example
 #+BEGIN_SRC bash
-  ./ontology_viz.py -o test.dot test.ttl -O ontology.ttl
+  python ./ontology_viz.py -o test.dot test.ttl -O ontology.ttl
   dot -Tpng -o test.png test.dot
 #+END_SRC
 
diff --git a/requirements.txt b/requirements.txt
index 86c28f5..ef977f9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-rdflib >= 6.0.0, < 7.0.0
+rdflib >= 6.0.2, <= 6.1.1
 graphviz == 0.17