diff --git a/opc-ua-sdk/sdk-core/src/main/java/org/eclipse/milo/opcua/sdk/core/types/codec/package-info.java b/opc-ua-sdk/sdk-core/src/main/java/org/eclipse/milo/opcua/sdk/core/types/codec/package-info.java
new file mode 100644
index 000000000..d20b3bd41
--- /dev/null
+++ b/opc-ua-sdk/sdk-core/src/main/java/org/eclipse/milo/opcua/sdk/core/types/codec/package-info.java
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2025 the Eclipse Milo Authors
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
+@NullMarked
+package org.eclipse.milo.opcua.sdk.core.types.codec;
+
+import org.jspecify.annotations.NullMarked;
diff --git a/opc-ua-sdk/sdk-core/src/main/java/org/eclipse/milo/opcua/sdk/core/types/package-info.java b/opc-ua-sdk/sdk-core/src/main/java/org/eclipse/milo/opcua/sdk/core/types/package-info.java
new file mode 100644
index 000000000..5b565cc92
--- /dev/null
+++ b/opc-ua-sdk/sdk-core/src/main/java/org/eclipse/milo/opcua/sdk/core/types/package-info.java
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2025 the Eclipse Milo Authors
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
+@NullMarked
+package org.eclipse.milo.opcua.sdk.core.types;
+
+import org.jspecify.annotations.NullMarked;