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diff --git a/src/objective-c/RxLibrary/GRXImmediateWriter.h b/src/objective-c/RxLibrary/GRXImmediateWriter.h
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+++ b/src/objective-c/RxLibrary/GRXImmediateWriter.h
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+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import <Foundation/Foundation.h>
+
+#import "GRXWriter.h"
+
+// Utility to construct GRXWriter instances from values that are immediately available when
+// required. The returned writers all support pausing and early termination.
+//
+// Unless the writeable callback pauses them or stops them early, these writers will do all their
+// interactions with the writeable before the start method returns.
+@interface GRXImmediateWriter : NSObject<GRXWriter>
+
+// Returns a writer that pulls values from the passed NSEnumerator instance and pushes them to
+// its writeable. The NSEnumerator is released when it finishes.
++ (id<GRXWriter>)writerWithEnumerator:(NSEnumerator *)enumerator;
+
+// Returns a writer that pushes to its writeable the successive values returned by the passed
+// block. When the block first returns nil, it is released.
++ (id<GRXWriter>)writerWithValueSupplier:(id (^)())block;
+
+// Returns a writer that iterates over the values of the passed container and pushes them to
+// its writeable. The container is released when the iteration is over.
+//
+// Note that the usual speed gain of NSFastEnumeration over NSEnumerator results from not having to
+// call one method per element. Because GRXWriteable instances accept values one by one, that speed
+// gain doesn't happen here.
++ (id<GRXWriter>)writerWithContainer:(id<NSFastEnumeration>)container;
+
+// Returns a writer that sends the passed value to its writeable and then finishes (releasing the
+// value).
++ (id<GRXWriter>)writerWithValue:(id)value;
+
+// Returns a writer that, as part of its start method, sends the passed error to the writeable
+// (then releasing the error).
++ (id<GRXWriter>)writerWithError:(NSError *)error;
+
+// Returns a writer that, as part of its start method, finishes immediately without sending any
+// values to its writeable.
++ (id<GRXWriter>)emptyWriter;
+
+@end