diff --git a/docs/conf.py b/docs/conf.py
index e45140a..d14f3da 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -43,3 +43,6 @@
     "https://docs.readthedocs.io/en/stable",
     "https://tmt.readthedocs.io/en/stable",
 ]
+hoverxref_domains = [
+    "cmake",
+]
diff --git a/docs/index.md b/docs/index.md
index 82a3080..b32ea0e 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -18,6 +18,16 @@ end-before: <!-- SPHINX-END -->
 ---
 ```
 
+{external+cmake:std:doc}`test external+cmake<manual/cmake-presets.7>`
+
+{external+rtd:std:doc}`test external+rtd<intro/getting-started-with-sphinx>`
+
+{external+tmt:std:doc}`test external+tmt<index>`
+
+{doc}`test interal doc ref<../guides/user>`
+
+{doc}`test external doc ref<tmt:index>`
+
 [cmake-presets]: <inv:cmake:std:doc#manual/cmake-presets.7>
 [copr]: https://copr.fedorainfracloud.org/
 [fedora]: https://src.fedoraproject.org/