Database watermarking has emerged as an effective solution to protect ownership of relational databases. Unlike images and videos, watermark insertion in databases can cause distortion leading to loss of data quality. In this paper, we propose a reversible database watermarking technique with distortion control. Firstly, we need to select optimal attributes for applying difference expansion. Pearson Correlation Coefficient (PCC) is employed to find a pair of attributes with the highest correlation. This ensures controlled distortion in the database. Later, difference expansion is applied on the selected attributes. It makes the method reversible and original data can be recovered whenever required. Experimental results show that the proposed method is robust against insertion, deletion, and modification attacks.