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diff --git a/src/main/java/com/beust/jcommander/IStringConverter.java b/src/main/java/com/beust/jcommander/IStringConverter.java
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+++ b/src/main/java/com/beust/jcommander/IStringConverter.java
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+/**
+ * Copyright (C) 2010 the original author or authors.
+ * See the notice.md file distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * 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 com.beust.jcommander;
+
+/**
+ * An interface that converts strings to any arbitrary type.
+ * 
+ * If your class implements a constructor that takes a String, this
+ * constructor will be used to instantiate your converter and the
+ * parameter will receive the name of the option that's being parsed,
+ * which can be useful to issue a more useful error message if the
+ * conversion fails.
+ * 
+ * You can also extend BaseConverter to make your life easier.
+ * 
+ * @author cbeust
+ */
+public interface IStringConverter<T> {
+  /**
+   * @return an object of type <T> created from the parameter value.
+   */
+  T convert(String value);
+}