This document summarizes a research paper on reversible image watermarking based on histogram shifting technique. It begins with an abstract that describes reversible watermarking and its goal of allowing exact recovery of the original image. It then provides background on reversible watermarking categories and discusses histogram shifting methods. The document outlines the proposed system, which aims to minimize distortion by selecting an optimal embedding point. It presents results comparing the proposed technique to previous histogram shifting methods, showing improved PSNR. Finally, it concludes the proposed method reduces image distortion through optimal embedding point selection.