diff --git a/middleware/http/wasm/benchmark_test.go b/middleware/http/wasm/benchmark_test.go
index 664c799635..57c54994f0 100644
--- a/middleware/http/wasm/benchmark_test.go
+++ b/middleware/http/wasm/benchmark_test.go
@@ -1,3 +1,16 @@
+/*
+Copyright 2023 The Dapr Authors
+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.
+*/
+
 package wasm
 
 import (
diff --git a/middleware/http/wasm/example/router.go b/middleware/http/wasm/example/router.go
index a0d5c5ff8e..311808f3a8 100644
--- a/middleware/http/wasm/example/router.go
+++ b/middleware/http/wasm/example/router.go
@@ -1,3 +1,16 @@
+/*
+Copyright 2023 The Dapr Authors
+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.
+*/
+
 package main
 
 import (
diff --git a/middleware/http/wasm/httpwasm.go b/middleware/http/wasm/httpwasm.go
index 7a529afe5e..88b4ca5eba 100644
--- a/middleware/http/wasm/httpwasm.go
+++ b/middleware/http/wasm/httpwasm.go
@@ -1,3 +1,16 @@
+/*
+Copyright 2023 The Dapr Authors
+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.
+*/
+
 package wasm
 
 import (
@@ -23,7 +36,7 @@ type middleware struct {
 }
 
 type Metadata struct {
-	// GuestConfig is the guest configuration, assigned during instantiation by handler.GuestConfig.
+	// GuestConfig is an optional configuration passed to WASM guests.
 	GuestConfig string `mapstructure:"guestConfig"`
 }
 
diff --git a/middleware/http/wasm/httpwasm_test.go b/middleware/http/wasm/httpwasm_test.go
index 1368a9113a..767419f14d 100644
--- a/middleware/http/wasm/httpwasm_test.go
+++ b/middleware/http/wasm/httpwasm_test.go
@@ -1,3 +1,16 @@
+/*
+Copyright 2023 The Dapr Authors
+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.
+*/
+
 package wasm
 
 import (
diff --git a/middleware/http/wasm/internal/e2e-guests/config/main.go b/middleware/http/wasm/internal/e2e-guests/config/main.go
index f98e172949..c0694f58e3 100644
--- a/middleware/http/wasm/internal/e2e-guests/config/main.go
+++ b/middleware/http/wasm/internal/e2e-guests/config/main.go
@@ -1,3 +1,16 @@
+/*
+Copyright 2023 The Dapr Authors
+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.
+*/
+
 // Package main ensures tests can prove logging or stdio isn't missed, both
 // during initialization (main) and request (rewrite).
 package main
diff --git a/middleware/http/wasm/internal/e2e-guests/output/main.go b/middleware/http/wasm/internal/e2e-guests/output/main.go
index 759dd10c12..08162512b3 100644
--- a/middleware/http/wasm/internal/e2e-guests/output/main.go
+++ b/middleware/http/wasm/internal/e2e-guests/output/main.go
@@ -1,3 +1,16 @@
+/*
+Copyright 2023 The Dapr Authors
+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.
+*/
+
 // Package main ensures tests can prove logging or stdio isn't missed, both
 // during initialization (main) and request (rewrite).
 package main
diff --git a/middleware/http/wasm/internal/e2e-guests/rewrite/main.go b/middleware/http/wasm/internal/e2e-guests/rewrite/main.go
index 0709daf91c..9325f9600d 100644
--- a/middleware/http/wasm/internal/e2e-guests/rewrite/main.go
+++ b/middleware/http/wasm/internal/e2e-guests/rewrite/main.go
@@ -1,3 +1,16 @@
+/*
+Copyright 2023 The Dapr Authors
+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.
+*/
+
 package main
 
 import (
diff --git a/middleware/http/wasm/internal/e2e_test.go b/middleware/http/wasm/internal/e2e_test.go
index fe32ebbc46..c3200b023f 100644
--- a/middleware/http/wasm/internal/e2e_test.go
+++ b/middleware/http/wasm/internal/e2e_test.go
@@ -1,3 +1,16 @@
+/*
+Copyright 2023 The Dapr Authors
+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.
+*/
+
 package internal_test
 
 import (