This paper provides an extension of Morris and Shin's (2002) model (Morris, S., Shin, H. S. (2002). Social value of public information. The American Economic Review, 92(5), 1521-1534.). It considers an "interpretation bias" of the public signal sent by central banks such as the ECB or the FED. It is shown that such a bias is detrimental and should be considered when central banks implement their communication policy.