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diff --git a/src/stubs/org/mapstruct/ap/spi/AstModifyingAnnotationProcessor.java b/src/stubs/org/mapstruct/ap/spi/AstModifyingAnnotationProcessor.java
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+++ b/src/stubs/org/mapstruct/ap/spi/AstModifyingAnnotationProcessor.java
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+/**
+ *  Copyright 2012-2017 Gunnar Morling (http://www.gunnarmorling.de/)
+ *  and/or other contributors as indicated by the @authors tag. See the
+ *  copyright.txt file in the distribution for a full listing of all
+ *  contributors.
+ *
+ *  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 org.mapstruct.ap.spi;
+
+import javax.lang.model.type.TypeMirror;
+
+/**
+ * A contract to be implemented by other annotation processors which - against the design philosophy of JSR 269 - alter
+ * the types under compilation.
+ * <p>
+ * This contract will be queried by MapStruct when examining types referenced by mappers to be generated, most notably
+ * the source and target types of mapping methods. If at least one AST-modifying processor announces further changes to
+ * such type, the generation of the affected mapper(s) will be deferred to a future round in the annnotation processing
+ * cycle.
+ * <p>
+ * Implementations are discovered via the service loader, i.e. a JAR providing an AST-modifying processor needs to
+ * declare its implementation in a file {@code META-INF/services/org.mapstruct.ap.spi.AstModifyingAnnotationProcessor}.
+ *
+ * @author Gunnar Morling
+ */
+//@org.mapstruct.util.Experimental
+public interface AstModifyingAnnotationProcessor {
+
+    /**
+     * Whether the specified type has been fully processed by this processor or not (i.e. this processor will amend the
+     * given type's structure after this invocation).
+     *
+     * @param type The type of interest
+     * @return {@code true} if this processor has fully processed the given type, {@code false} otherwise.
+     */
+    boolean isTypeComplete(TypeMirror type);
+}
+\ No newline at end of file