diff --git a/doc/howtos/process/docbuild.rst b/doc/howtos/process/docbuild.rst
index a8590162f..6e43c36a0 100644
--- a/doc/howtos/process/docbuild.rst
+++ b/doc/howtos/process/docbuild.rst
@@ -122,13 +122,14 @@ Depending on your Linux version, install the needed tools:
 
   .. code-block:: bash
 
-     sudo apt-get install doxygen python3-pip python3-wheel make
+     sudo apt-get install doxygen python3-pip \
+       python3-wheel make graphviz
 
 * For Fedora use:
 
   .. code-block:: bash
 
-     sudo dnf install doxygen python3-pip python3-wheel make
+     sudo dnf install doxygen python3-pip python3-wheel make graphviz
 
 And for either Linux environment, install the remaining python-based
 tools: