These notes attempt to address the concerns raised by Weil Hong, and supplement the notes on Poroelasticity, diffusion in an elastic solid. The main purpose is to add electrical effects, so that the theory will apply to polyelectrolyte gels. I’ll adopt an approach developed by Suo, Zhao and Greene for elastic dielectric (JMPS 2007 or preprint). The theory, however, has been developed by many people in many ways. See references at the end of the notes.