diff --git a/rust/libs/algorithm/Cargo.toml b/rust/libs/algorithm/Cargo.toml
index 48a1ba975a..c4ca71aef8 100644
--- a/rust/libs/algorithm/Cargo.toml
+++ b/rust/libs/algorithm/Cargo.toml
@@ -1,3 +1,18 @@
+#
+# Copyright (C) 2019-2024 vdaas.org vald team <vald@vdaas.org>
+#
+# 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
+#
+#    https://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.
+#
 [package]
 name = "algorithm"
 version = "0.1.0"
diff --git a/rust/libs/algorithm/src/lib.rs b/rust/libs/algorithm/src/lib.rs
index b93cf3ffd9..cdca5d93de 100644
--- a/rust/libs/algorithm/src/lib.rs
+++ b/rust/libs/algorithm/src/lib.rs
@@ -1,3 +1,18 @@
+//
+// Copyright (C) 2019-2024 vdaas.org vald team <vald@vdaas.org>
+//
+// 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
+//
+//    https://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.
+//
 pub fn add(left: u64, right: u64) -> u64 {
     left + right
 }
diff --git a/rust/libs/algorithms/faiss/Cargo.toml b/rust/libs/algorithms/faiss/Cargo.toml
index 9daa862e5d..bfe824b11e 100644
--- a/rust/libs/algorithms/faiss/Cargo.toml
+++ b/rust/libs/algorithms/faiss/Cargo.toml
@@ -1,3 +1,18 @@
+#
+# Copyright (C) 2019-2024 vdaas.org vald team <vald@vdaas.org>
+#
+# 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
+#
+#    https://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.
+#
 [package]
 name = "faiss"
 version = "0.1.0"
diff --git a/rust/libs/algorithms/faiss/src/lib.rs b/rust/libs/algorithms/faiss/src/lib.rs
index b93cf3ffd9..cdca5d93de 100644
--- a/rust/libs/algorithms/faiss/src/lib.rs
+++ b/rust/libs/algorithms/faiss/src/lib.rs
@@ -1,3 +1,18 @@
+//
+// Copyright (C) 2019-2024 vdaas.org vald team <vald@vdaas.org>
+//
+// 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
+//
+//    https://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.
+//
 pub fn add(left: u64, right: u64) -> u64 {
     left + right
 }