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diff --git a/tensorflow/contrib/session_bundle/manifest.proto b/tensorflow/contrib/session_bundle/manifest.proto
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+++ b/tensorflow/contrib/session_bundle/manifest.proto
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+syntax = "proto3";
+
+package tensorflow.contrib;
+
+// Signatures of model export.
+message Signatures {
+  // Default signature of the graph.
+  // WARNING(break-tutorial-inline-code): The following code snippet is
+  // in-lined in tutorials, please update tutorial documents accordingly
+  // whenever code changes.
+  Signature default_signature = 1;
+
+  // Named signatures of the graph.
+  map<string, Signature> named_signatures = 2;
+};
+
+// A binding to a tensor including the name and, possibly in the future, type
+// or other metadata. For example, this may specify whether a tensor supports
+// batch vs single inference.
+message TensorBinding {
+  // The name of the tensor to bind to.
+  string tensor_name = 1;
+};
+
+// An asset file or set of sharded files with the same name that will be bound
+// to a tensor at init / session_bundle load time.
+message AssetFile {
+  // The tensor to bind the asset filename to.
+  TensorBinding tensor_binding = 1;
+  // The filename within the assets directory. Note: does not include the base
+  // path or asset directory prefix. Base paths can and will change when models
+  // are deployed for serving.
+  string filename = 2;
+}
+
+// A Signature specifies the inputs and outputs of commonly used graphs.
+message Signature {
+  oneof type {
+    RegressionSignature regression_signature = 1;
+    ClassificationSignature classification_signature = 2;
+    GenericSignature generic_signature = 3;
+  }
+};
+
+// RegressionSignature specifies a graph that takes an input and returns an
+// output.
+message RegressionSignature {
+  TensorBinding input = 1;
+  TensorBinding output = 2;
+};
+
+// ClassificationSignature specifies a graph that takes an input and returns
+// classes and their scores.
+// WARNING(break-tutorial-inline-code): The following code snippet is
+// in-lined in tutorials, please update tutorial documents accordingly
+// whenever code changes.
+message ClassificationSignature {
+  TensorBinding input = 1;
+  TensorBinding classes = 2;
+  TensorBinding scores = 3;
+};
+
+// GenericSignature specifies a map from logical name to Tensor name.
+// Typical application of GenericSignature is to use a single GenericSignature
+// that includes all of the Tensor nodes and target names that may be useful at
+// serving, analysis or debugging time. The recommended name for this signature
+// in the ModelManifest is "generic_bindings".
+message GenericSignature {
+  map<string, TensorBinding> map = 1;
+};