Rechtsbehelfsbelehrung
The paragraph at the end of a decision telling you how and by when you can challenge it.
It names the remedy (objection, court action), the deadline and where to send it. If it is missing or wrong, often a deadline of one year applies (§ 356 Abs. 2 AO, § 66 Abs. 2 SGG, § 58 Abs. 2 VwGO).
How it appears in the letter
»Gegen diesen Bescheid kann innerhalb eines Monats … Widerspruch erhoben werden.«