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diff --git a/src/core/lombok/NonNull.java b/src/core/lombok/NonNull.java
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+++ b/src/core/lombok/NonNull.java
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+/*
+ * Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package lombok;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Lombok is smart enough to translate any annotation named {@code @NonNull} or {@code @NotNull} in any casing and
+ * with any package name to the return type of generated getters and the parameter of generated setters and constructors,
+ * as well as generate the appropriate null checks in the setter and constructor.
+ * 
+ * You can use this annotation for the purpose, though you can also use JSR305's annotation, findbugs's, pmd's, or IDEA's, or just
+ * about anyone elses. As long as it is named {@code @NonNull} or {@code @NotNull}.
+ * 
+ * WARNING: If the java community ever does decide on supporting a single {@code @NonNull} annotation (for example via JSR305), then
+ * this annotation will <strong>be deleted</strong> from the lombok package. If the need to update an import statement scares
+ * you, you should use your own annotation named {@code @NonNull} instead of this one.
+ */
+@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE})
+@Retention(RetentionPolicy.CLASS)
+public @interface NonNull {}