diff --git a/devtools.txt b/devtools.txt
index 7d11556..adf89ca 100644
--- a/devtools.txt
+++ b/devtools.txt
@@ -9,3 +9,4 @@ isort  # isort src/wireviz/*py
 # Development aids
 pudb       # import pudb; pudb.set_trace()
 autoflake  # autoflake -i --remove-all-unused-imports src/wireviz/*.py
+pyan       # pyan3 src/wireviz/*.py -uncge --html > temp/pyan.html