A Jewish Holiday
The change was made to accommodate those who observe Passover. Corn syrup, along with a few other foods, is forbidden during the annual Jewish holiday. On the other hand, Sucrose isn’t forbidden, so Passover-observant people can still enjoy a Coke—just the kind with the yellow cap. The beverage behemoth appears to be serious about making Coke a year-round beverage.
Kosher
The special caps basically tell you that “this drink is kosher during Passover.” In terms of products that meet Jewish food and beverage standards, the Hebrew term Kosher means “fit, proper, or correct.” To put it another way, it’s a stamp of approval. During Passover, anything that is not kosher is forbidden. The holiday is usually observed for about a week in the spring, and there are other customs that are observed.