diff --git a/jinja2/nodes.py b/jinja2/nodes.py
index 2519682..180478d 100644
--- a/jinja2/nodes.py
+++ b/jinja2/nodes.py
@@ -727,6 +727,9 @@
 class ExtensionAttribute(Expr):
     """Returns the attribute of an extension bound to the environment.
     The identifier is the identifier of the :class:`Extension`.
+
+    This node is usually constructed by calling the
+    :meth:`~jinja2.ext.Extension.attr` method on an extension.
     """
     fields = ('identifier', 'attr')