diff --git a/docs/extensions-schema.json b/docs/extensions-schema.json
new file mode 100644
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--- /dev/null
+++ b/docs/extensions-schema.json
@@ -0,0 +1,28 @@
+{
+    "$schema": "https://json-schema.org/draft-07/schema",
+    "title": "Neoteroi markdown extensions",
+    "markdownDescription": "https://www.neoteroi.dev/mkdocs-plugins",
+    "oneOf": [
+      {
+        "title": "Cards – Neoteroi Markdown",
+        "markdownDescription": "https://www.neoteroi.dev/mkdocs-plugins/cards/",
+        "const": "neoteroi.cards"
+      },
+      {
+        "title": "Timeline – Neoteroi Markdown",
+        "markdownDescription": "https://www.neoteroi.dev/mkdocs-plugins/timeline/",
+        "const": "neoteroi.timeline"
+      },
+      {
+        "title": "Gantt – Neoteroi Markdown",
+        "markdownDescription": "https://www.neoteroi.dev/mkdocs-plugins/gantt/",
+        "const": "neoteroi.projects"
+      },
+      {
+        "title": "Spantable – Neoteroi Markdown",
+        "markdownDescription": "https://www.neoteroi.dev/mkdocs-plugins/spantable/",
+        "const": "neoteroi.spantable"
+      }
+    ]
+  }
+  
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