diff --git a/docs/examples/CuCO.rst b/docs/examples/CuCO.rst
index a850e5e..5e1ff7e 100644
--- a/docs/examples/CuCO.rst
+++ b/docs/examples/CuCO.rst
@@ -219,3 +219,8 @@ or can be run via :ref:`cli` tools.
 
    Snapshot of the graph of the entire workflow needed to generate the last 
    row, after completing all runs.
+
+.. note::
+    `Graphviz 
+    <https://graphviz.readthedocs.io/en/stable/manual.html#installation>`_
+    needs to be properly installed, for the graph to be generated.
diff --git a/docs/examples/CuCO_relay.rst b/docs/examples/CuCO_relay.rst
index 6282fab..760830a 100644
--- a/docs/examples/CuCO_relay.rst
+++ b/docs/examples/CuCO_relay.rst
@@ -179,3 +179,8 @@ or can be run via :ref:`cli` tools.
 
    Snapshot of the graph of the entire workflow needed to generate the last 
    row, after completing all runs.
+
+.. note::
+    `Graphviz 
+    <https://graphviz.readthedocs.io/en/stable/manual.html#installation>`_
+    needs to be properly installed, for the graph to be generated.