The Warsaw Stock Exchange announced on Friday that it planned to Kernel (WSE: KER PW) to its WIG-20 index as of March 18, 2011. Meanwhile, the exchange also said it would include Astarta (WSE: AST PW) to its WIG-40 index, and Milkiland (WSE: MLK PW) and Agroton (WSE: AGT PW) to its WIG-80 index, as of the same date.