diff --git a/build.gradle.kts b/build.gradle.kts
index b0a69ef7..38ef157c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2024 Glavo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 plugins {
     id("java-library")
     id("jacoco")
diff --git a/kala-base/src/main/java/kala/collection/base/primitive/PrimitiveMapIterator.java b/kala-base/src/main/java/kala/collection/base/primitive/PrimitiveMapIterator.java
new file mode 100644
index 00000000..431c8747
--- /dev/null
+++ b/kala-base/src/main/java/kala/collection/base/primitive/PrimitiveMapIterator.java
@@ -0,0 +1,22 @@
+/*
+ * Copyright 2024 Glavo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package kala.collection.base.primitive;
+
+import kala.collection.base.MapIterator;
+
+public interface PrimitiveMapIterator<K, V> extends MapIterator<K, V> {
+
+}