diff --git a/benchmark-java/src/main/resources/application.conf b/benchmark-java/src/main/resources/application.conf
index 1fafded59..44658337d 100644
--- a/benchmark-java/src/main/resources/application.conf
+++ b/benchmark-java/src/main/resources/application.conf
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 pekko.loglevel = INFO
 
 pekko.actor.default-dispatcher {
diff --git a/project/project-info.conf b/project/project-info.conf
index 9fb1f0c16..2232c6bce 100644
--- a/project/project-info.conf
+++ b/project/project-info.conf
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 project-info {
   version: "current"
   shared-info {
diff --git a/sbt-plugin/src/sbt-test/gen-scala-server/00-interop/src/main/resources/application.conf b/sbt-plugin/src/sbt-test/gen-scala-server/00-interop/src/main/resources/application.conf
index d3e0fb335..9775f4fba 100644
--- a/sbt-plugin/src/sbt-test/gen-scala-server/00-interop/src/main/resources/application.conf
+++ b/sbt-plugin/src/sbt-test/gen-scala-server/00-interop/src/main/resources/application.conf
@@ -1 +1,3 @@
+# SPDX-License-Identifier: Apache-2.0
+
 pekko.http.server.preview.enable-http2 = on
diff --git a/sbt-plugin/src/sbt-test/scala3/01-basic-client-server/src/main/resources/application.conf b/sbt-plugin/src/sbt-test/scala3/01-basic-client-server/src/main/resources/application.conf
index 36720da1f..eae10f7ae 100644
--- a/sbt-plugin/src/sbt-test/scala3/01-basic-client-server/src/main/resources/application.conf
+++ b/sbt-plugin/src/sbt-test/scala3/01-basic-client-server/src/main/resources/application.conf
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 pekko.http.server.preview.enable-http2 = on
 
 pekko.grpc.client."*" {
diff --git a/scripts/link-validator.conf b/scripts/link-validator.conf
index 18e337480..007fba427 100644
--- a/scripts/link-validator.conf
+++ b/scripts/link-validator.conf
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 site-link-validator {
   root-dir = "./docs/target/site/"
   # relative to `root-dir`