diff --git a/minidom/README.md b/minidom/README.md
index bfee3dce..a5c046e3 100644
--- a/minidom/README.md
+++ b/minidom/README.md
@@ -6,3 +6,7 @@ What's this?
 
 A minimal DOM library on top of rxml, targeting exclusively the subset of
 XML useful for XMPP.
+
+| Restriction | Supported ✅ | Unsupported ❌ |
+| - | - | - |
+| Namespaces are mandatory | `<a xmlns="ns"></a>` | `<a></a>` |