diff --git a/mediapipe/gpu/copy_calculator.proto b/mediapipe/gpu/copy_calculator.proto
new file mode 100644
index 000000000..0eb8e2957
--- /dev/null
+++ b/mediapipe/gpu/copy_calculator.proto
@@ -0,0 +1,35 @@
+// Copyright 2019 The MediaPipe Authors.
+//
+// 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.
+
+syntax = "proto2";
+
+package mediapipe;
+
+import "mediapipe/framework/calculator.proto";
+
+option cc_api_version = 2;
+
+message CopyCalculatorOptions {
+  extend CalculatorOptions {
+    optional CopyCalculatorOptions ext = 161773876;
+  }
+
+  enum Rotation {
+    NONE = 0;
+    CCW = 1;       // rotate 90 degrees counterclockwise
+    CCW_FLIP = 2;  // hack to rectify convfloat
+  }
+
+  optional Rotation rotation = 1 [default = NONE];
+}
diff --git a/mediapipe/graphs/hand_tracking/hand_tracking_mobile.pbtxt b/mediapipe/graphs/hand_tracking/hand_tracking_mobile.pbtxt
index fdc40d163..dc8cb3d11 100644
--- a/mediapipe/graphs/hand_tracking/hand_tracking_mobile.pbtxt
+++ b/mediapipe/graphs/hand_tracking/hand_tracking_mobile.pbtxt
@@ -98,7 +98,7 @@ node {
 
 # Merges a stream of hand rectangles generated by HandDetectionSubgraph and that
 # generated by HandLandmarkSubgraph into a single output stream by selecting
-# between one of the two streams. The formal is selected if the incoming packet
+# between one of the two streams. The former is selected if the incoming packet
 # is not empty, i.e., hand detection is performed on the current image by
 # HandDetectionSubgraph (because HandLandmarkSubgraph could not identify hand
 # presence in the previous image). Otherwise, the latter is selected, which is