A notation on a share certificate (Swedish: anteckning på aktiebrev) means that an event affecting the shares is recorded directly on the share certificate. Examples include a bonus issue, a rights issue or a redemption of shares, which can change the owners' holdings.
A notation on the share certificate does not replace the notation in the share ledger. The certificate and share ledger need to match so each share's history can be followed.

A share certificate is written proof that a person owns certain shares in a limited company.
Read more
A notation in the share ledger records a circumstance relating to a share or its owner.
Read more
A share ledger is a record of a company's shares and who its shareholders are.
Read more
An exchange of share certificates means old certificates are replaced with new ones, often after changes.
Read more