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diff --git a/bsfs/query/ast/__init__.py b/bsfs/query/ast/__init__.py
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+"""Query AST components.
+
+The query AST consists of a Filter and a Fetch syntax trees.
+
+Classes beginning with an underscore (_) represent internal type hierarchies
+and should not be used for parsing. Note that the AST structures do not
+(and cannot) check semantic validity or consistency with a given schema.
+
+"""
+# imports
+import typing
+
+# inner-module imports
+from . import fetch
+from . import filter_ as filter # pylint: disable=redefined-builtin
+
+# exports
+__all__: typing.Sequence[str] = (
+    'fetch',
+    'filter',
+    )
+
+## EOF ##