diff --git a/source/conf.py b/source/conf.py
index 858da97..e3ff7fd 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -16,6 +16,7 @@ author = 'Michaël Ricart'
 extensions = [
     "sphinx_datatables",
     "sphinxcontrib.jquery",
+    "sphinxcontrib.d2lang",
 ]
 
 templates_path = ['_templates']