diff --git a/spacepackets/ccsds/spacepacket.py b/spacepackets/ccsds/spacepacket.py
index 9260ebd..848b1ec 100644
--- a/spacepackets/ccsds/spacepacket.py
+++ b/spacepackets/ccsds/spacepacket.py
@@ -73,7 +73,8 @@ def from_raw(cls, raw: int):
 
 
 class PacketId:
-    """The packet ID forms the last thirteen bits of the first two bytes of the space packet header."""
+    """The packet ID forms the last thirteen bits of the first two bytes of the
+    space packet header."""
 
     def __init__(self, ptype: PacketType, sec_header_flag: bool, apid: int):
         if apid > pow(2, 11) - 1 or apid < 0: