Why are there stones on the headstones?

From Ask Rabbi Simmons..."We are taught that it is an act of ultimate kindness and respect to bury someone and place a marker at the site. After a person is buried, of course, we can no longer participate in burying them. However, even if a tombstone has been erected, we can participate in the mitzvah of making a marker at a grave, by adding to the stone. Therefore, customarily, we place stones on top of a gravestone whenever we visit to indicate our participation in the mitzvah of erecting a tombstone, even if only in a more symbolic way."

© E. Shatara, 2008