diff --git a/pgpainless-core/src/main/kotlin/org/pgpainless/exception/KeyException.kt b/pgpainless-core/src/main/kotlin/org/pgpainless/exception/KeyException.kt
index de9a7211..56d685c9 100644
--- a/pgpainless-core/src/main/kotlin/org/pgpainless/exception/KeyException.kt
+++ b/pgpainless-core/src/main/kotlin/org/pgpainless/exception/KeyException.kt
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2025 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.exception
 
 import java.util.*
diff --git a/pgpainless-core/src/main/kotlin/org/pgpainless/exception/MissingPassphraseException.kt b/pgpainless-core/src/main/kotlin/org/pgpainless/exception/MissingPassphraseException.kt
index 010f4fc7..ee404a99 100644
--- a/pgpainless-core/src/main/kotlin/org/pgpainless/exception/MissingPassphraseException.kt
+++ b/pgpainless-core/src/main/kotlin/org/pgpainless/exception/MissingPassphraseException.kt
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2025 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.exception
 
 import java.util.*