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Recently, Hwang et al. (HKC) proposed a simple improvement reversible data hiding scheme based on the histogram shift. They claim that the read don't send any additional information to the receiver in their scheme. However, it will generate an informal distribution in the histogram when the secret data is embedded into a cover image. In this paper, we will use this defect to propose a method to show that HKC scheme is impractical. In other words, any adversary is also able to trace the embedding secret data position from the stego-image's histogram.