diff --git a/README.md b/README.md
index 4034efefb..6e178acdc 100644
--- a/README.md
+++ b/README.md
@@ -20,8 +20,7 @@ See mobile and desktop [examples](mediapipe/docs/examples.md).
 A web-based visualizer is hosted on [MediaPipe Visualizer](https://mediapipe-viz.appspot.com/). Please also see instructions [here](mediapipe/docs/visualizer.md).
 
 ## Publications
-* [MediaPipe: A Framework for Perceiving and Augmenting Reality](http://mixedreality.cs.cornell.edu/s/22_crv2_MediaPipe_CVPR_CV4ARVR_Workshop_2019_v2.pdf), extended abstract for [Third Workshop on Computer Vision for AR/VR](https://sites.google.com/corp/view/perception-cv4arvr/mediapipe).
-* Full-length draft: [MediaPipe: A Framework for Building Perception Pipelines](https://tiny.cc/mediapipe_paper)
+* [MediaPipe: A Framework for Building Perception Pipelines](https://tiny.cc/mediapipe_paper) (draft)
 
 ## Contributing
 We welcome contributions. Please follow these [guidelines](./CONTRIBUTING.md).
diff --git a/mediapipe/framework/formats/rect.proto b/mediapipe/framework/formats/rect.proto
index 1fe677977..9a33a0e39 100644
--- a/mediapipe/framework/formats/rect.proto
+++ b/mediapipe/framework/formats/rect.proto
@@ -30,3 +30,19 @@ message Rect {
   // Rotation angle is counter-clockwise in radian.
   optional float rotation = 5 [default = 0.0];
 }
+
+// A rectangle with rotation in normalized coordinates. The values of box center
+// location and size are within [0, 1].
+message NormalizedRect {
+  // Location of the center of the rectangle in image coordinates.
+  // The (0.0, 0.0) point is at the (top, left) corner.
+  required float x_center = 1;
+  required float y_center = 2;
+
+  // Size of the rectangle.
+  required float height = 3;
+  required float width = 4;
+
+  // Rotation angle is counter-clockwise in radian.
+  optional float rotation = 5 [default = 0.0];
+}