diff --git a/README.md b/README.md
index ceffb7a..772042c 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Codebase for arXiv preprint ["NeRF++: Analyzing and Improving Neural Radiance Fi
 * Data format. 
     * Each scene consists of 3 splits: train/test/validation. 
     * Intrinsics and poses are stored as flattened 4x4 matrices (row-major).
-    * Pixel coordinate of an image's upper-left corner is (column, row)=(0, 0). 
+    * Pixel coordinate of an image's upper-left corner is (column, row)=(0, 0), lower-right corner is (width-1, height-1).
     * Poses are camera-to-world, not world-to-camera transformations.
     * Opencv camera coordinate system is adopted, i.e., x--->right, y--->down, z--->scene.
     * To convert camera poses between Opencv and Opengl conventions, the following code snippet can be used for both Opengl2Opencv and Opencv2Opengl.