So lipidation is the process by which we add a lipid component onto our polypeptide chain. Now, why would we want to add a lipid component onto a polypeptide chain? Well, basically, those proteins that ultimately end up in a membrane, for example, the mitochondrial membrane, the endoplasmic reticulum membrane, or the plasma membrane, these proteins that end up on a membrane need to actually incorporate themselves into those membranes. And because lipids, or because membranes consist of lipids, by adding a lipid component onto our protein, we're increasing that protein's affinity to the membrane. So this process is known as lipidation. So we saw that phosphorylation, methylation glycosylation, proteollysis, and acetylation and lipidation are six different processes that are known as posttranslational modification.