diff --git a/authfs/src/lib.rs b/authfs/src/lib.rs
new file mode 100644
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--- /dev/null
+++ b/authfs/src/lib.rs
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//! This crate provides a FUSE-based, non-generic filesystem that I/O is authenticated. This
+//! filesystem assumes the storage layer is not trusted, e.g. file is provided by an untrusted VM,
+//! and the content can't be simply trusted. The filesystem can use its public key to verify a
+//! (read-only) file against its associated fs-verity signature by a trusted party. With the Merkle
+//! tree, each read of file block can be verified individually.
+//!
+//! The implementation is not finished.
+
+mod reader;