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diff --git a/Firestore/Source/Public/FIRDocumentChange.h b/Firestore/Source/Public/FIRDocumentChange.h
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+/*
+ * Copyright 2017 Google
+ *
+ * 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.
+ */
+
+#import <Foundation/Foundation.h>
+
+#import "FIRFirestoreSwiftNameSupport.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class FIRDocumentSnapshot;
+
+/** An enumeration of document change types. */
+typedef NS_ENUM(NSInteger, FIRDocumentChangeType) {
+  /** Indicates a new document was added to the set of documents matching the query. */
+  FIRDocumentChangeTypeAdded,
+  /** Indicates a document within the query was modified. */
+  FIRDocumentChangeTypeModified,
+  /**
+   * Indicates a document within the query was removed (either deleted or no longer matches
+   * the query.
+   */
+  FIRDocumentChangeTypeRemoved
+} FIR_SWIFT_NAME(DocumentChangeType);
+
+/**
+ * A `FIRDocumentChange` represents a change to the documents matching a query. It contains the
+ * document affected and the type of change that occurred (added, modified, or removed).
+ */
+FIR_SWIFT_NAME(DocumentChange)
+@interface FIRDocumentChange : NSObject
+
+/**   */
+- (id)init __attribute__((unavailable("FIRDocumentChange cannot be created directly.")));
+
+/** The type of change that occurred (added, modified, or removed). */
+@property(nonatomic, readonly) FIRDocumentChangeType type;
+
+/** The document affected by this change. */
+@property(nonatomic, strong, readonly) FIRDocumentSnapshot *document;
+
+/**
+ * The index of the changed document in the result set immediately prior to this FIRDocumentChange
+ * (i.e. supposing that all prior FIRDocumentChange objects have been applied). NSNotFound for
+ * FIRDocumentChangeTypeAdded events.
+ */
+@property(nonatomic, readonly) NSUInteger oldIndex;
+
+/**
+ * The index of the changed document in the result set immediately after this FIRDocumentChange
+ * (i.e. supposing that all prior FIRDocumentChange objects and the current FIRDocumentChange object
+ * have been applied). NSNotFound for FIRDocumentChangeTypeRemoved events.
+ */
+@property(nonatomic, readonly) NSUInteger newIndex;
+
+@end
+
+NS_ASSUME_NONNULL_END