diff --git a/.gitignore b/.gitignore
index 771491b..1870603 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
-# SPDX-FileCopyrightText: Copyright (c) 2026 APN
-# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: Copyright (c) 2026 APN.
+# SPDX-License-Identifier: MIT.
 
 *.pb.go
 *.pb.swift
diff --git a/REUSE.toml b/REUSE.toml
index 01ac2ea..082cf05 100644
--- a/REUSE.toml
+++ b/REUSE.toml
@@ -1,5 +1,5 @@
-# SPDX-FileCopyrightText: Copyright (c) 2026 APN
-# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: Copyright (c) 2026 APN.
+# SPDX-License-Identifier: MIT.
 
 version = 1
 [[annotations]]
diff --git a/auth.proto b/auth.proto
index d0acc93..c667fe3 100644
--- a/auth.proto
+++ b/auth.proto
@@ -1,5 +1,5 @@
-// SPDX-FileCopyrightText: Copyright (c) 2026 APN
-// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: Copyright (c) 2026 APN.
+// SPDX-License-Identifier: MIT.
 
 syntax = "proto3";
 package proto;
diff --git a/ping.proto b/ping.proto
index 421566a..e32b1c4 100644
--- a/ping.proto
+++ b/ping.proto
@@ -1,5 +1,5 @@
-// SPDX-FileCopyrightText: Copyright (c) 2026 APN
-// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: Copyright (c) 2026 APN.
+// SPDX-License-Identifier: MIT.
 
 syntax = "proto3";
 package proto;
diff --git a/pong.proto b/pong.proto
index c407632..14ed343 100644
--- a/pong.proto
+++ b/pong.proto
@@ -1,5 +1,5 @@
-// SPDX-FileCopyrightText: Copyright (c) 2026 APN
-// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: Copyright (c) 2026 APN.
+// SPDX-License-Identifier: MIT.
 
 syntax = "proto3";
 package proto;
diff --git a/welcome.proto b/welcome.proto
index b49064b..91b9d92 100644
--- a/welcome.proto
+++ b/welcome.proto
@@ -1,5 +1,5 @@
-// SPDX-FileCopyrightText: Copyright (c) 2026 APN
-// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: Copyright (c) 2026 APN.
+// SPDX-License-Identifier: MIT.
 
 syntax = "proto3";
 package proto;