 However, the watermark area still only features Apolinario Mabini and the embedded security thread was on the right side of the signature of BSP governor from the 1985 version of the banknote until 1998.In 1998, Andres Bonifacio was added on the watermark area of the banknote and the embedded security thread was aligned beside the portrait.In 1999, the names of the signatories on the bills were added starting with banknotes featuring the signature of President Joseph Estrada.