diff --git a/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/ArmorCmd.kt b/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/ArmorCmd.kt
index cb6bc79..ccfba4d 100644
--- a/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/ArmorCmd.kt
+++ b/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/ArmorCmd.kt
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package sop.cli.picocli.commands
 
 import java.io.IOException
diff --git a/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/DearmorCmd.kt b/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/DearmorCmd.kt
index 9ae97c6..09d2a71 100644
--- a/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/DearmorCmd.kt
+++ b/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/DearmorCmd.kt
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package sop.cli.picocli.commands
 
 import java.io.IOException
diff --git a/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/DecryptCmd.kt b/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/DecryptCmd.kt
index 95298c2..1e688b3 100644
--- a/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/DecryptCmd.kt
+++ b/sop-java-picocli/src/main/kotlin/sop/cli/picocli/commands/DecryptCmd.kt
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package sop.cli.picocli.commands
 
 import java.io.IOException